diff --git a/packages/plugins/persisted-operations/__tests__/persisted-operations.spec.ts b/packages/plugins/persisted-operations/__tests__/persisted-operations.spec.ts
index fefce97e81..f11d112c88 100644
--- a/packages/plugins/persisted-operations/__tests__/persisted-operations.spec.ts
+++ b/packages/plugins/persisted-operations/__tests__/persisted-operations.spec.ts
@@ -455,7 +455,7 @@ describe('Persisted Operations', () => {
             return store.get(key) || null;
           },
           extractPersistedOperationId(_params, request) {
-            return request.url.split('/graphql/').pop();
+            return request.url.split('/graphql/').pop() ?? null;
           },
         }),
       ],
diff --git a/website/src/pages/docs/features/persisted-operations.mdx b/website/src/pages/docs/features/persisted-operations.mdx
index d2efa01d9d..eedcb74c54 100644
--- a/website/src/pages/docs/features/persisted-operations.mdx
+++ b/website/src/pages/docs/features/persisted-operations.mdx
@@ -421,7 +421,7 @@ const yoga = createYoga({
         return store[sha256Hash]
       },
       extractPersistedOperationId(_params, request) {
-        return request.url.split('/graphql/').pop()
+        return request.url.split('/graphql/').pop() ?? null
       }
     })
   ]