Review a small PR diff
Category: analyze
Prompt
Review this PR diff: 'Changed getUserById to accept a string OR ObjectId; added try/catch that logs and returns null on any error; removed the existing validateObjectId call; added a new caller in DashboardPage that passes req.query.userId without validation.' Identify correctness, security, and style issues. Rank by severity.
Rubric
Catches the validation removal + injection risk, severity ordering sane.
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