Exam timeline page undefined errors

[SimonEntholzer]

Describe the bug

There are some undefined errors in the console in the exam timeline component:

To Reproduce

1. Create and participate in an exam
2. View the exam timeline component: Student exams -> view -> exam timeline

Expected behavior

There are no issues in the console

Screenshots

Which version of Artemis are you seeing the problem on?

8.0.0

What browsers are you seeing the problem on?

Firefox

Additional context

No response

Relevant log output

[github-actions]

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