[Bug] 500 Internal Server Error when posting a comment

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Description

I encountered a persistent 500 Internal Server Error when attempting to post a comment on the challenge page. The "Post" button does not trigger any successful action, and the console shows a server-side failure.

Steps to Reproduce

1. Go to any challenge page (e.g., Matrix Power).
2. Type a comment in the comment section.
3. Click the "Post" button.
4. Observe that the comment is not added and check the DevTools Console.

Expected Behavior

The comment should be successfully posted and visible to other users.

Actual Behavior

The server returns a 500 Internal Server Error (HTTP 500).