Describe the bug

In a group chat with not explicit name set, when sending an answer post in a thread, an internal server error occurred.

To Reproduce

1. Go to a group chat with no name (or create a new group chat)
2. Create a base post
3. Reply to that post in a thread
4. Notice the "Internal Server error"

Expected behavior

No error should occur

Screenshots

Which version of Artemis are you seeing the problem on?

8.0.0 - current develop branch

What browsers are you seeing the problem on?

Chrome

Additional context

No response

Relevant log output