diff --git a/bodhi-server/bodhi/server/buildsys.py b/bodhi-server/bodhi/server/buildsys.py
index 4cc6b9fe14..ef55b077a1 100644
--- a/bodhi-server/bodhi/server/buildsys.py
+++ b/bodhi-server/bodhi/server/buildsys.py
@@ -247,7 +247,6 @@ def getBuild(self, build='TurboGears-1.0.2.2-2.fc17', other=False, testing=False
                     format_data['repository'] = "{}/{}".format(fedora_release, name)
 
                 data['extra'] = {
-                    'container_koji_task_id': 19708268,
                     'typeinfo': {
                         'image': {
                             'index': {
diff --git a/bodhi-server/bodhi/server/models.py b/bodhi-server/bodhi/server/models.py
index 08ffaa7def..1439b09b26 100644
--- a/bodhi-server/bodhi/server/models.py
+++ b/bodhi-server/bodhi/server/models.py
@@ -586,6 +586,8 @@ def infer_content_class(cls, base, build):
         Returns:
             BodhiBase: The type-specific child class of base that is appropriate to use with the
             given koji build.
+        Raises:
+            ValueError: If there is no appropriate child class
         """
         # Default value.  Overridden below if we find markers in the build info
         identity = cls.rpm
@@ -593,8 +595,14 @@ def infer_content_class(cls, base, build):
         extra = build.get('extra') or {}
         if 'module' in extra.get('typeinfo', {}):
             identity = cls.module
-        elif 'container_koji_task_id' in extra:
-            if 'flatpak' in extra['typeinfo']['image']:
+        elif 'image' in extra.get('typeinfo', {}):
+            image_info = extra['typeinfo']['image']
+            if 'pull' not in image_info.get('index', {}):
+                raise ValueError(
+                    (f"Image build {build['nvr']} cannot be used for update, "
+                     "it has no pull specs")
+                )
+            if 'flatpak' in image_info:
                 identity = cls.flatpak
             else:
                 identity = cls.container
diff --git a/bodhi-server/tests/services/test_updates.py b/bodhi-server/tests/services/test_updates.py
index ef8eaa6b48..4d3118d6a3 100644
--- a/bodhi-server/tests/services/test_updates.py
+++ b/bodhi-server/tests/services/test_updates.py
@@ -34,7 +34,7 @@
 
 from bodhi.messages.schemas import base as base_schemas
 from bodhi.messages.schemas import update as update_schemas
-from bodhi.server import main
+from bodhi.server import buildsys, main
 from bodhi.server.config import config
 from bodhi.server.exceptions import BodhiException, LockedUpdateException
 from bodhi.server.models import (
@@ -678,6 +678,32 @@ def test_new_flatpak_update(self, *args):
         assert up['karma'] == 0
         assert up['requirements'] == 'rpmlint'
 
+    @mock.patch(**mock_uuid4_version1)
+    @mock.patch(**mock_valid_requirements)
+    def test_new_image_update_no_pull(self, *args):
+        self.create_release('28F')
+        data = self.get_update('mariadb-10.1-10.f28flatpak')
+
+        build = buildsys.get_session().getBuild('mariadb-10.1-10.f28flatpak')
+        del build['extra']['typeinfo']['image']['index']['pull']
+
+        with mock.patch("bodhi.server.buildsys.DevBuildsys.getBuild", return_value=build):
+            r = self.app.post_json('/updates/', data, status=500)
+
+        assert r.json_body == {
+            'errors': [
+                {
+                    'description': (
+                        'Image build mariadb-10.1-10.f28flatpak cannot be used for update, '
+                        'it has no pull specs'
+                    ),
+                    'location': 'body',
+                    'name': 'ValueError',
+                }
+            ],
+            'status': 'error',
+        }
+
     @mock.patch.dict('bodhi.server.validators.config', {'acl_system': 'dummy'})
     @mock.patch(**mock_valid_requirements)
     def test_new_update_with_multiple_bugs(self, *args):
diff --git a/news/PR5496.bug b/news/PR5496.bug
new file mode 100644
index 0000000000..a5bfc33024
--- /dev/null
+++ b/news/PR5496.bug
@@ -0,0 +1 @@
+Fixed the detection of Flatpak update type