diff --git a/backend/test/services/model.spec.ts b/backend/test/services/model.spec.ts
index 496776d18..c003c5a79 100644
--- a/backend/test/services/model.spec.ts
+++ b/backend/test/services/model.spec.ts
@@ -120,6 +120,15 @@ describe('services > model', () => {
     expect(modelMocks.save).not.toBeCalled()
   })
 
+  test('createModel > should throw an internal error if getUserInformation fails due to invalid user', async () => {
+    authenticationMocks.getUserInformation.mockImplementation(() => {
+      throw new Error('Unable to find user user:unknown_user')
+    })
+    expect(() =>
+      createModel({} as any, { collaborators: [{ entity: 'user:unknown_user', roles: [] }] } as any),
+    ).rejects.toThrowError(/^Unable to find user user:unknown_user/)
+  })
+
   test('getModelById > good', async () => {
     modelMocks.findOne.mockResolvedValueOnce('mocked')
 
@@ -327,6 +336,15 @@ describe('services > model', () => {
     ).rejects.toThrowError(/^You cannot select both mirror settings simultaneously./)
   })
 
+  test('updateModel > should throw an internal error if getUserInformation fails due to invalid user', async () => {
+    authenticationMocks.getUserInformation.mockImplementation(() => {
+      throw new Error('Unable to find user user:unknown_user')
+    })
+    expect(() =>
+      updateModel({} as any, '123', { collaborators: [{ entity: 'user:unknown_user', roles: [] }] }),
+    ).rejects.toThrowError(/^Unable to find user user:unknown_user/)
+  })
+
   test('createModelcardFromSchema > should throw an error when attempting to change a model from mirrored to standard', async () => {
     vi.mocked(authorisation.model).mockResolvedValue({
       info: 'Cannot alter a mirrored model.',