diff --git a/packages/twenty-front/src/modules/object-record/hooks/useCreateManyRecords.ts b/packages/twenty-front/src/modules/object-record/hooks/useCreateManyRecords.ts
index 5fd639305c..a348b1cbd1 100644
--- a/packages/twenty-front/src/modules/object-record/hooks/useCreateManyRecords.ts
+++ b/packages/twenty-front/src/modules/object-record/hooks/useCreateManyRecords.ts
@@ -133,7 +133,7 @@ export const useCreateManyRecords = <
             currentWorkspaceMember: currentWorkspaceMember,
             recordInput: {
               ...baseOptimisticRecordInputCreatedBy,
-              ...recordToCreate,
+              ...sanitizedRecord,
             },
             objectPermissionsByObjectMetadataId,
           }),
diff --git a/packages/twenty-front/src/modules/object-record/hooks/useCreateOneRecord.ts b/packages/twenty-front/src/modules/object-record/hooks/useCreateOneRecord.ts
index ef1ba30e71..34002485fe 100644
--- a/packages/twenty-front/src/modules/object-record/hooks/useCreateOneRecord.ts
+++ b/packages/twenty-front/src/modules/object-record/hooks/useCreateOneRecord.ts
@@ -101,8 +101,7 @@ export const useCreateOneRecord = <
       objectMetadataItems,
       recordInput: {
         ...computeOptimisticCreateRecordBaseRecordInput(objectMetadataItem),
-        ...recordInput,
-        id: idForCreation,
+        ...sanitizedInput,
       },
       objectPermissionsByObjectMetadataId,
     });
diff --git a/packages/twenty-front/src/modules/object-record/utils/__tests__/computeOptimisticRecordFromInput.test.ts b/packages/twenty-front/src/modules/object-record/utils/__tests__/computeOptimisticRecordFromInput.test.ts
index e3e1dddc89..4f43c2c5e7 100644
--- a/packages/twenty-front/src/modules/object-record/utils/__tests__/computeOptimisticRecordFromInput.test.ts
+++ b/packages/twenty-front/src/modules/object-record/utils/__tests__/computeOptimisticRecordFromInput.test.ts
@@ -5,6 +5,7 @@ import { updateRecordFromCache } from '@/object-record/cache/utils/updateRecordF
 import { generateDepthRecordGqlFieldsFromRecord } from '@/object-record/graphql/record-gql-fields/utils/generateDepthRecordGqlFieldsFromRecord';
 import { type FieldActorForInputValue } from '@/object-record/record-field/ui/types/FieldMetadata';
 import { computeOptimisticRecordFromInput } from '@/object-record/utils/computeOptimisticRecordFromInput';
+import { sanitizeRecordInput } from '@/object-record/utils/sanitizeRecordInput';
 import { type WorkspaceMember } from '@/workspace-member/types/WorkspaceMember';
 import { InMemoryCache } from '@apollo/client';
 import { mockedWorkspaceMemberRecords } from '~/testing/mock-data/generated/data/workspaceMembers/mock-workspaceMembers-data';
@@ -274,4 +275,31 @@ describe('computeOptimisticRecordFromInput', () => {
       `"Should never occur, encountered unknown fields unknwon, foo, bar in objectMetadataItem person"`,
     );
   });
+
+  // Regression test for #15800
+  it('should not throw when the input has been sanitized first', () => {
+    const cache = new InMemoryCache();
+    const personObjectMetadataItem = getMockObjectMetadataItemOrThrow('person');
+
+    const sanitizedInput = sanitizeRecordInput({
+      objectMetadataItem: personObjectMetadataItem,
+      recordInput: {
+        city: 'Paris',
+        nonExistentField: 'should be stripped',
+      },
+    });
+
+    const result = computeOptimisticRecordFromInput({
+      currentWorkspaceMember,
+      objectMetadataItems: getTestEnrichedObjectMetadataItemsMock(),
+      objectMetadataItem: personObjectMetadataItem,
+      recordInput: sanitizedInput,
+      cache,
+      objectPermissionsByObjectMetadataId: {},
+    });
+
+    expect(result).toEqual({
+      city: 'Paris',
+    });
+  });
 });