diff --git a/backend/alembic/versions/4f3b20f156c1_init_caseinfo.py b/backend/alembic/versions/4f3b20f156c1_init_caseinfo.py
index beff7c45..ae048b17 100644
--- a/backend/alembic/versions/4f3b20f156c1_init_caseinfo.py
+++ b/backend/alembic/versions/4f3b20f156c1_init_caseinfo.py
@@ -44,7 +44,7 @@ def upgrade():
         sa.Column("sex", sa.Enum("Male", "Female", "Unknown", name="sex"), nullable=True),
         sa.Column("age_of_onset_month", sa.Integer(), nullable=True),
         sa.Column(
-            "ethinicity",
+            "ethnicity",
             sa.Enum(
                 "AfricanAmerican",
                 "AshkenaziJewish",
diff --git a/backend/app/models/caseinfo.py b/backend/app/models/caseinfo.py
index 18fef30f..3e9b66c9 100644
--- a/backend/app/models/caseinfo.py
+++ b/backend/app/models/caseinfo.py
@@ -40,7 +40,7 @@ class CaseInfo(Base):
         affected_family_members: bool
         sex: Sex
         age_of_onset_month: int
-        ethinicity: Ethnicity
+        ethnicity: Ethnicity
         zygosity: Zygosity
         family_segregation: bool
     else:
@@ -65,7 +65,7 @@ class CaseInfo(Base):
         #: Age of onset of the patient.
         age_of_onset_month = Column(Integer, nullable=True)
         #: Ethnicity of the patient.
-        ethinicity = Column(Enum(Ethnicity), nullable=True)
+        ethnicity = Column(Enum(Ethnicity), nullable=True)
         #: Zygosity of the patient.
         zygosity = Column(Enum(Zygosity), nullable=True)
         #: Family segregation of the patient.
diff --git a/backend/app/schemas/caseinfo.py b/backend/app/schemas/caseinfo.py
index b1647b55..91617df5 100644
--- a/backend/app/schemas/caseinfo.py
+++ b/backend/app/schemas/caseinfo.py
@@ -65,7 +65,7 @@ class CaseInfoBase(BaseModel):
     affected_family_members: bool | None = None
     sex: Sex = Sex.Unknown
     age_of_onset_month: int | None = None
-    ethinicity: Ethnicity = Ethnicity.Unknown
+    ethnicity: Ethnicity = Ethnicity.Unknown
     zygosity: Zygosity = Zygosity.Unknown
     family_segregation: bool | None = None
 
diff --git a/backend/tests/api/api_v1/test_caseinfo.py b/backend/tests/api/api_v1/test_caseinfo.py
index ae6b8dd5..ac436925 100644
--- a/backend/tests/api/api_v1/test_caseinfo.py
+++ b/backend/tests/api/api_v1/test_caseinfo.py
@@ -38,7 +38,7 @@ async def test_create_caseinfo(
             "affected_family_members": True,
             "sex": "reev:unknown_sex",
             "age_of_onset_month": 20,
-            "ethinicity": "reev:unknown_ethnicity",
+            "ethnicity": "reev:unknown_ethnicity",
             "zygosity": "reev:unknown_zygosity",
             "family_segregation": True,
         },
@@ -53,7 +53,7 @@ async def test_create_caseinfo(
     assert response.json()["affected_family_members"] == True
     assert response.json()["sex"] == "reev:unknown_sex"
     assert response.json()["age_of_onset_month"] == 20
-    assert response.json()["ethinicity"] == "reev:unknown_ethnicity"
+    assert response.json()["ethnicity"] == "reev:unknown_ethnicity"
     assert response.json()["zygosity"] == "reev:unknown_zygosity"
     assert response.json()["family_segregation"] == True
 
diff --git a/backend/tests/crud/test_caseinfo.py b/backend/tests/crud/test_caseinfo.py
index ea779fb4..84705eca 100644
--- a/backend/tests/crud/test_caseinfo.py
+++ b/backend/tests/crud/test_caseinfo.py
@@ -25,7 +25,7 @@ def case_create() -> CaseInfoCreate:
         affected_family_members=True,
         sex=Sex.Unknown,
         age_of_onset_month=20,
-        ethinicity=Ethnicity.Unknown,
+        ethnicity=Ethnicity.Unknown,
         zygosity=Zygosity.Unknown,
         family_segregation=True,
         user=uuid.uuid4(),
@@ -48,7 +48,7 @@ async def test_create_get_caseinfo(db_session: AsyncSession, case_create: CaseIn
     assert caseinfo_postcreate.affected_family_members == stored_item.affected_family_members
     assert caseinfo_postcreate.sex == stored_item.sex
     assert caseinfo_postcreate.age_of_onset_month == stored_item.age_of_onset_month
-    assert caseinfo_postcreate.ethinicity == stored_item.ethinicity
+    assert caseinfo_postcreate.ethnicity == stored_item.ethnicity
     assert caseinfo_postcreate.zygosity == stored_item.zygosity
     assert caseinfo_postcreate.family_segregation == stored_item.family_segregation
 
@@ -81,7 +81,7 @@ async def test_get_multi_by_user(db_session: AsyncSession, case_create: CaseInfo
     assert caseinfo_postcreate.affected_family_members == stored_items[0].affected_family_members
     assert caseinfo_postcreate.sex == stored_items[0].sex
     assert caseinfo_postcreate.age_of_onset_month == stored_items[0].age_of_onset_month
-    assert caseinfo_postcreate.ethinicity == stored_items[0].ethinicity
+    assert caseinfo_postcreate.ethnicity == stored_items[0].ethnicity
     assert caseinfo_postcreate.zygosity == stored_items[0].zygosity
     assert caseinfo_postcreate.family_segregation == stored_items[0].family_segregation
 
@@ -105,6 +105,6 @@ async def test_get_by_user(db_session: AsyncSession, case_create: CaseInfoCreate
     assert caseinfo_postcreate.affected_family_members == stored_item.affected_family_members
     assert caseinfo_postcreate.sex == stored_item.sex
     assert caseinfo_postcreate.age_of_onset_month == stored_item.age_of_onset_month
-    assert caseinfo_postcreate.ethinicity == stored_item.ethinicity
+    assert caseinfo_postcreate.ethnicity == stored_item.ethnicity
     assert caseinfo_postcreate.zygosity == stored_item.zygosity
     assert caseinfo_postcreate.family_segregation == stored_item.family_segregation
diff --git a/docs/dev_quickstart.rst b/docs/dev_quickstart.rst
index c0936a36..094bb9cf 100644
--- a/docs/dev_quickstart.rst
+++ b/docs/dev_quickstart.rst
@@ -128,6 +128,23 @@ You have to restart jupyterlab manually.
 Now you can navigate to the frontend development server at http://localhost:8081.
 This server will transparently forward the API requests to the backend server at http://localhost:8081.
 
+---------------
+Troubleshooting
+---------------
+
+Issues with nested git submodules.
+    We have put the shared code into ``frontend/src/ext/reev-frontend-lib``.
+    Make sure that you get a fresh clone of the repository with the ``--recursive`` flag.
+    To initialize the submodules, use ``git submodule update --init --recursive``.
+    You can reset the submodule to the version stored in the main ``reev`` repository with ``git submodule foreach --recursive git reset --hard``.
+
+Issues with ``reev-frontend-lib`` as a submodule.
+    Having the library as a submodule is useful for development.
+    There are some drawbacks.
+    If you see **weird issues with typescript that you don't understand**, try to ``rm -rf frontend/src/ext/reev-frontend-lib/{node_modules,dist}``.
+    Such issues include problems with assigning the reactive classes from ``vue``, such as ``ref`` and ``computed``, or other weird stuff with types.
+    In this case, try to clear out the directories described above and restart VS Code.
+
 -----
 Notes
 -----
diff --git a/frontend/src/api/caseInfo/api.spec.ts b/frontend/src/api/caseInfo/api.spec.ts
index d3367448..13498e44 100644
--- a/frontend/src/api/caseInfo/api.spec.ts
+++ b/frontend/src/api/caseInfo/api.spec.ts
@@ -12,12 +12,12 @@ const mockCaseInfo: CaseInfo = {
   diseases: [],
   hpoTerms: [],
   inheritance: Inheritance.Unknown,
-  affectedFamilyMembers: null,
+  affectedFamilyMembers: undefined,
   sex: Sex.Unknown,
-  ageOfOnsetMonths: null,
+  ageOfOnsetMonths: undefined,
   ethnicity: Ethnicity.Unknown,
   zygosity: Zygosity.Unknown,
-  familySegregation: null
+  familySegregation: undefined
 }
 
 describe.concurrent('CaseInfo Client', () => {
diff --git a/frontend/src/api/caseInfo/types.ts b/frontend/src/api/caseInfo/types.ts
index 039f8bb8..24ec7ea3 100644
--- a/frontend/src/api/caseInfo/types.ts
+++ b/frontend/src/api/caseInfo/types.ts
@@ -51,42 +51,46 @@ export enum Zygosity {
 
 /** Case Info as returned by API */
 export interface CaseInfo$Api {
+  id?: string
+  user?: string
   affected_family_members: boolean | null
   age_of_onset_month: number | null
   diseases: any[] // Replace with the actual type from your API
-  ethinicity: string
+  ethnicity: string
   family_segregation: boolean | null
   hpo_terms: any[] // Replace with the actual type from your API
-  id: string
   inheritance: string | null
   pseudonym: string
   sex: string | null
-  user: string
   zygosity: string
 }
 
 /** Interface for the case data, for storage and API. */
 export interface CaseInfo {
-  /* The case pseudonym. */
+  /** The case info ID. */
+  id?: string
+  /** The user ID. */
+  user?: string
+  /** The case pseudonym. */
   pseudonym: string
-  /* Orphanet / OMIM disease(s). */
+  /** Orphanet / OMIM disease(s). */
   diseases: OmimTerm[]
-  /* HPO terms. */
+  /** HPO terms. */
   hpoTerms: HpoTerm[]
-  /* Inheritance. */
+  /** Inheritance. */
   inheritance: Inheritance
-  /* Affected family members. */
-  affectedFamilyMembers: boolean | null
-  /* Sex. */
+  /** Affected family members. */
+  affectedFamilyMembers?: boolean
+  /** Sex. */
   sex: Sex
-  /* Age of onset in month. */
-  ageOfOnsetMonths: number | null
-  /* Ethnicity. */
+  /** Age of onset in month. */
+  ageOfOnsetMonths?: number
+  /** Ethnicity. */
   ethnicity: Ethnicity
-  /* Zygosity. */
+  /** Zygosity. */
   zygosity: Zygosity
-  /* Family segregation. */
-  familySegregation: boolean | null
+  /** Family segregation. */
+  familySegregation?: boolean
 }
 
 /**
@@ -95,16 +99,35 @@ export interface CaseInfo {
 export class CaseInfo$Type {
   fromJson(apiResponse: CaseInfo$Api): CaseInfo {
     return {
+      id: apiResponse.id,
+      user: apiResponse.user,
       pseudonym: apiResponse.pseudonym,
       diseases: apiResponse.diseases,
-      hpoTerms: apiResponse.hpo_terms,
+      hpoTerms: apiResponse.hpo_terms ?? [],
       inheritance: apiResponse.inheritance as Inheritance,
-      affectedFamilyMembers: apiResponse.affected_family_members,
-      sex: apiResponse.sex as Sex,
-      ageOfOnsetMonths: apiResponse.age_of_onset_month,
-      ethnicity: apiResponse.ethinicity as Ethnicity,
+      affectedFamilyMembers: apiResponse.affected_family_members ?? undefined,
+      sex: (apiResponse.sex as Sex) ?? undefined,
+      ageOfOnsetMonths: apiResponse.age_of_onset_month ?? undefined,
+      ethnicity: apiResponse.ethnicity as Ethnicity,
       zygosity: apiResponse.zygosity as Zygosity,
-      familySegregation: apiResponse.family_segregation
+      familySegregation: apiResponse.family_segregation ?? undefined
+    }
+  }
+
+  toJson(caseInfo: CaseInfo): CaseInfo$Api {
+    return {
+      id: caseInfo.id,
+      user: caseInfo.user,
+      pseudonym: caseInfo.pseudonym,
+      diseases: caseInfo.diseases,
+      hpo_terms: caseInfo.hpoTerms,
+      inheritance: caseInfo.inheritance,
+      affected_family_members: caseInfo.affectedFamilyMembers ?? null,
+      sex: caseInfo.sex,
+      age_of_onset_month: caseInfo.ageOfOnsetMonths ?? null,
+      ethnicity: caseInfo.ethnicity,
+      zygosity: caseInfo.zygosity,
+      family_segregation: caseInfo.familySegregation ?? null
     }
   }
 }
diff --git a/frontend/src/components/CaseInformationCard/CaseInformationCard.vue b/frontend/src/components/CaseInformationCard/CaseInformationCard.vue
index 9a95b251..786f2f35 100644
--- a/frontend/src/components/CaseInformationCard/CaseInformationCard.vue
+++ b/frontend/src/components/CaseInformationCard/CaseInformationCard.vue
@@ -13,11 +13,16 @@ import {
   StorageMode,
   Zygosity,
   ZygosityLabels,
-  ethinicityLabels,
+  ethnicityLabels,
   useCaseInfoStore
 } from '@/stores/caseInfo'
 import { useTermsStore } from '@/stores/terms'
 
+/** This component's emits. */
+const emit = defineEmits<{
+  (eventName: 'clickClose'): void
+}>()
+
 const caseStore = useCaseInfoStore()
 const termsStore = useTermsStore()
 const cadaPrioStore = useCadaPrioStore()
@@ -41,7 +46,7 @@ const inheritanceOptions = computed(() => {
 const ethnicityOptions = computed(() => {
   return Object.values(Ethnicity).map((value) => {
     return {
-      text: ethinicityLabels.get(value),
+      text: ethnicityLabels.get(value),
       value: value
     }
   })
@@ -278,8 +283,16 @@ watch(
                 />
 
                 <!-- Buttons -->
-                <v-btn class="ml-2" @click="saveChanges"> Save Changes </v-btn>
-                <v-btn class="ml-2" color="secondary" @click="deleteCaseInformation">
+                <v-btn class="ml-2" color="primary" @click="saveChanges"> Save Changes </v-btn>
+                <v-btn class="ml-2" color="primary" @click="emit('clickClose')">
+                  Close Window
+                </v-btn>
+                <v-btn
+                  class="ml-2"
+                  color="warning"
+                  variant="outlined"
+                  @click="deleteCaseInformation"
+                >
                   Delete Case info
                 </v-btn>
               </v-form>
diff --git a/frontend/src/components/PageHeader/PageHeader.vue b/frontend/src/components/PageHeader/PageHeader.vue
index f2bab3be..5dc2fbb3 100644
--- a/frontend/src/components/PageHeader/PageHeader.vue
+++ b/frontend/src/components/PageHeader/PageHeader.vue
@@ -44,6 +44,9 @@ const searchTermRef = ref<string>('')
 /** Component state; genome build. */
 const genomeBuildRef = ref<GenomeBuild>('grch37')
 
+/** Whether to show the case info box. */
+const showCaseInfo = ref<boolean>(false)
+
 /** Helper function to between light and dark theme. */
 function toggleTheme() {
   theme.global.name.value = theme.global.current.value.dark ? 'customLightTheme' : 'dark'
@@ -80,16 +83,12 @@ function toggleTheme() {
         <v-icon>mdi-theme-light-dark</v-icon>
       </v-btn>
 
-      <v-dialog scrollable width="auto" location="top">
-        <template #activator="{ props: vProps }">
-          <v-btn class="mr-4" prepend-icon="mdi-account-group" v-bind="vProps"> Case Info </v-btn>
-        </template>
-        <v-card>
-          <CaseInformationCard />
-        </v-card>
-      </v-dialog>
+      <v-btn class="mr-4" prepend-icon="mdi-account-group" @click="showCaseInfo = true">
+        Case Info
+      </v-btn>
 
       <UserProfileButton />
+
       <v-menu id="menu">
         <template #activator="{ props: vProps }">
           <v-btn icon="mdi-dots-vertical" v-bind="vProps" />
@@ -112,4 +111,10 @@ function toggleTheme() {
       </v-menu>
     </v-container>
   </v-app-bar>
+
+  <v-dialog v-model="showCaseInfo" scrollable width="auto" location="top">
+    <v-card>
+      <CaseInformationCard @click-close="showCaseInfo = false" />
+    </v-card>
+  </v-dialog>
 </template>
diff --git a/frontend/src/components/ProfileCaseCard/ProfileCaseCard.vue b/frontend/src/components/ProfileCaseCard/ProfileCaseCard.vue
index af5e16a9..c74b55fe 100644
--- a/frontend/src/components/ProfileCaseCard/ProfileCaseCard.vue
+++ b/frontend/src/components/ProfileCaseCard/ProfileCaseCard.vue
@@ -13,7 +13,7 @@ import {
   SexLabels,
   Zygosity,
   ZygosityLabels,
-  ethinicityLabels,
+  ethnicityLabels,
   useCaseInfoStore
 } from '@/stores/caseInfo'
 import { useTermsStore } from '@/stores/terms'
@@ -41,7 +41,7 @@ const inheritanceOptions = computed(() => {
 const ethnicityOptions = computed(() => {
   return Object.values(Ethnicity).map((value) => {
     return {
-      text: ethinicityLabels.get(value),
+      text: ethnicityLabels.get(value),
       value: value
     }
   })
diff --git a/frontend/src/components/SeqvarClinsigCard/SeqvarClinsigCard.vue b/frontend/src/components/SeqvarClinsigCard/SeqvarClinsigCard.vue
index 9b7f8b04..0871e920 100644
--- a/frontend/src/components/SeqvarClinsigCard/SeqvarClinsigCard.vue
+++ b/frontend/src/components/SeqvarClinsigCard/SeqvarClinsigCard.vue
@@ -8,7 +8,6 @@ component via the `errorDisplay` event and are handled there.
 <script setup lang="ts">
 import DocsLink from '@bihealth/reev-frontend-lib/components/DocsLink/DocsLink.vue'
 import { type Seqvar } from '@bihealth/reev-frontend-lib/lib/genomicVars'
-import { StoreState } from '@bihealth/reev-frontend-lib/stores'
 import { computed, onMounted, ref, watch } from 'vue'
 import { useTheme } from 'vuetify'
 
diff --git a/frontend/src/components/StrucvarClinsigCard/StrucvarClinsigCard.vue b/frontend/src/components/StrucvarClinsigCard/StrucvarClinsigCard.vue
index b37a4e32..6bd2da1e 100644
--- a/frontend/src/components/StrucvarClinsigCard/StrucvarClinsigCard.vue
+++ b/frontend/src/components/StrucvarClinsigCard/StrucvarClinsigCard.vue
@@ -8,7 +8,6 @@ component via the `errorDisplay` event and are handled there.
 <script setup lang="ts">
 import DocsLink from '@bihealth/reev-frontend-lib/components/DocsLink/DocsLink.vue'
 import type { Strucvar } from '@bihealth/reev-frontend-lib/lib/genomicVars'
-import { StoreState } from '@bihealth/reev-frontend-lib/stores'
 import { computed, onMounted, ref, watch } from 'vue'
 
 import { useStrucvarAcmgRatingStore } from '@/stores/strucvarAcmgRating'
diff --git a/frontend/src/stores/caseInfo/constants.ts b/frontend/src/stores/caseInfo/constants.ts
index 09d3bac1..59cf239c 100644
--- a/frontend/src/stores/caseInfo/constants.ts
+++ b/frontend/src/stores/caseInfo/constants.ts
@@ -12,16 +12,18 @@ export const SexLabels = new Map<Sex, string>([
 
 /** Default case information. */
 export const DEFAULT_CASE_INFO: CaseInfo = {
+  id: 'iduuid',
+  user: 'useruuid',
   pseudonym: '',
   diseases: [],
   hpoTerms: [],
   inheritance: Inheritance.Unknown,
-  affectedFamilyMembers: null,
+  affectedFamilyMembers: undefined,
   sex: Sex.Unknown,
-  ageOfOnsetMonths: null,
+  ageOfOnsetMonths: undefined,
   ethnicity: Ethnicity.Unknown,
   zygosity: Zygosity.Unknown,
-  familySegregation: null
+  familySegregation: undefined
 }
 
 /** Labels for `Zygosity`. */
@@ -33,7 +35,7 @@ export const ZygosityLabels = new Map<Zygosity, string>([
 ])
 
 /** Labels for `Ethnicity`. */
-export const ethinicityLabels = new Map<Ethnicity, string>([
+export const ethnicityLabels = new Map<Ethnicity, string>([
   [Ethnicity.AfricanAmerican, 'African American'],
   [Ethnicity.AshkenaziJewish, 'Ashkenazi Jewish'],
   [Ethnicity.EastAsian, 'East Asian'],
diff --git a/frontend/src/stores/caseInfo/store.spec.ts b/frontend/src/stores/caseInfo/store.spec.ts
index 6bcc5193..e5a4ca43 100644
--- a/frontend/src/stores/caseInfo/store.spec.ts
+++ b/frontend/src/stores/caseInfo/store.spec.ts
@@ -4,7 +4,7 @@ import { setActivePinia } from 'pinia'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 import createFetchMock from 'vitest-fetch-mock'
 
-import { type ApiResponse } from '@/api/caseInfo'
+import { type ApiResponse, CaseInfo } from '@/api/caseInfo'
 
 import { DEFAULT_CASE_INFO } from './constants'
 import { LOCAL_STORAGE_PREFIX } from './constants'
@@ -22,7 +22,7 @@ const MOCK_RESPONSE: ApiResponse = {
   affected_family_members: null,
   sex: Sex.Unknown,
   age_of_onset_month: null,
-  ethinicity: Ethnicity.Unknown,
+  ethnicity: Ethnicity.Unknown,
   zygosity: Zygosity.Unknown,
   family_segregation: null
 }
@@ -299,12 +299,12 @@ describe('case store with logged in user', () => {
       "diseases": [],\n\
       "hpo_terms": [],\n\
       "inheritance": "reev:unknown_inheritance",\n\
-      "affected_family_members": null,\n\
+      "affected_family_members": undefined,\n\
       "sex": "reev:unknown_sex",\n\
-      "age_of_onset_month": null,\n\
+      "age_of_onset_month": undefined,\n\
       "ethincity": "reev:unknown_ethnicity",\n\
       "zygosity": "reev:unknown_zygosity",\n\
-      "family_segregation": null\n\
+      "family_segregation": undefined\n\
     }'
     })
     expect(store.storeState).toBe(StoreState.Active)
@@ -365,7 +365,7 @@ describe('case store with local storage', () => {
   it('deleteCase() should delete case information', async () => {
     // arrange:
     const caseInfo = { ...DEFAULT_CASE_INFO, pseudonym: 'TestPseudonym' }
-    localStorage.setItem(ITEM_KEY, JSON.stringify(caseInfo))
+    localStorage.setItem(ITEM_KEY, JSON.stringify(CaseInfo.toJson(caseInfo)))
     const store = useCaseInfoStore()
     store.caseInfo = caseInfo
 
@@ -388,7 +388,7 @@ describe('case store with local storage', () => {
     // arrange:
     const caseInfo = { ...DEFAULT_CASE_INFO, pseudonym: 'TestPseudonym' }
     const store = useCaseInfoStore()
-    localStorage.setItem(ITEM_KEY, JSON.stringify(caseInfo))
+    localStorage.setItem(ITEM_KEY, JSON.stringify(CaseInfo.toJson(caseInfo)))
     expect(store.caseInfo).toStrictEqual(DEFAULT_CASE_INFO)
 
     // act:
@@ -398,7 +398,7 @@ describe('case store with local storage', () => {
     expect(fetchMocker).not.toBeCalled()
     expect(store.storeState).toBe(StoreState.Active)
     expect(store.caseInfo).toStrictEqual(caseInfo)
-    expect(localStorage.getItem(ITEM_KEY)).toStrictEqual(JSON.stringify(caseInfo))
+    expect(localStorage.getItem(ITEM_KEY)).toStrictEqual(JSON.stringify(CaseInfo.toJson(caseInfo)))
     expect(getItemSpy).toBeCalled()
     expect(setItemSpy).toBeCalled()
     expect(removeItemSpy).not.toHaveBeenCalled()
@@ -407,7 +407,7 @@ describe('case store with local storage', () => {
 
   it('updateCase() should update case information', async () => {
     // arrange:
-    localStorage.setItem(ITEM_KEY, JSON.stringify(DEFAULT_CASE_INFO))
+    localStorage.setItem(ITEM_KEY, JSON.stringify(CaseInfo.toJson(DEFAULT_CASE_INFO)))
     const store = useCaseInfoStore()
     const updatedCaseInfo = { ...DEFAULT_CASE_INFO, pseudonym: 'test' }
     expect(store.storeState).toBe(StoreState.Initial)
@@ -420,7 +420,9 @@ describe('case store with local storage', () => {
     expect(fetchMocker).not.toBeCalled()
     expect(store.storeState).toBe(StoreState.Active)
     expect(store.caseInfo).toEqual(updatedCaseInfo)
-    expect(localStorage.getItem(ITEM_KEY)).toStrictEqual(JSON.stringify(updatedCaseInfo))
+    expect(localStorage.getItem(ITEM_KEY)).toStrictEqual(
+      JSON.stringify(CaseInfo.toJson(updatedCaseInfo))
+    )
     expect(getItemSpy).toBeCalled()
     expect(setItemSpy).toBeCalled()
     expect(removeItemSpy).not.toHaveBeenCalled()
diff --git a/frontend/src/stores/caseInfo/store.ts b/frontend/src/stores/caseInfo/store.ts
index 52e797ed..e5fa4f5d 100644
--- a/frontend/src/stores/caseInfo/store.ts
+++ b/frontend/src/stores/caseInfo/store.ts
@@ -84,8 +84,22 @@ export const useCaseInfoStore = defineStore('caseInfo', () => {
       if (!storeData) {
         clearData()
       } else {
-        caseInfo.value = JSON.parse(storeData) as CaseInfo
+        caseInfo.value = CaseInfo.fromJson(JSON.parse(storeData))
       }
+
+      // Ensure that we do not obtain undefined HPO terms.  This is similar to
+      // the code in the case info card.  In the error case, we clear the data.
+      // This can happen if the user has "legacy" data. in the local store.
+      try {
+        const tmp = caseInfo.value.hpoTerms.map((term) => term.termId)
+        // @ts-ignore
+        if (tmp.includes(undefined)) {
+          throw new Error('Invalid HPO terms')
+        }
+      } catch (e) {
+        clearData()
+      }
+
       storeState.value = StoreState.Active
     } else {
       storeState.value = StoreState.Loading
@@ -117,7 +131,10 @@ export const useCaseInfoStore = defineStore('caseInfo', () => {
     if (storageMode.value === StorageMode.Local) {
       storeState.value = StoreState.Loading
       caseInfo.value = caseData
-      localStorage.setItem(`${LOCAL_STORAGE_PREFIX}.caseInfo`, JSON.stringify(caseData))
+      localStorage.setItem(
+        `${LOCAL_STORAGE_PREFIX}.caseInfo`,
+        JSON.stringify(CaseInfo.toJson(caseData))
+      )
       storeState.value = StoreState.Active
     } else {
       storeState.value = StoreState.Loading
diff --git a/frontend/src/stores/caseInfo/types.ts b/frontend/src/stores/caseInfo/types.ts
index 61098361..4dfd202b 100644
--- a/frontend/src/stores/caseInfo/types.ts
+++ b/frontend/src/stores/caseInfo/types.ts
@@ -51,6 +51,10 @@ export enum Zygosity {
 
 /** Interface for the case data, for storage and API. */
 export interface CaseInfo {
+  /* The case ID. */
+  id?: string
+  /* The user ID. */
+  user?: string
   /* The case pseudonym. */
   pseudonym: string
   /* Orphanet / OMIM disease(s). */
@@ -60,15 +64,15 @@ export interface CaseInfo {
   /* Inheritance. */
   inheritance: Inheritance
   /* Affected family members. */
-  affectedFamilyMembers: boolean | null
+  affectedFamilyMembers?: boolean
   /* Sex. */
   sex: Sex
   /* Age of onset in month. */
-  ageOfOnsetMonths: number | null
+  ageOfOnsetMonths?: number
   /* Ethnicity. */
   ethnicity: Ethnicity
   /* Zygosity. */
   zygosity: Zygosity
   /* Family segregation. */
-  familySegregation: boolean | null
+  familySegregation?: boolean
 }