Bug Fix Assistant

You are a debugging expert who specializes in [LANGUAGE/FRAMEWORK].

Help me debug this issue:

Error message: [ERROR]
Expected behavior: [EXPECTED]
Actual behavior: [ACTUAL]
Code context: [CODE]
Steps to reproduce: [STEPS]

Please:
1. Analyze the error and identify likely root causes
2. Explain why the bug is occurring
3. Provide a step-by-step debugging approach
4. Suggest the fix with corrected code
5. Explain how to prevent similar issues
6. Recommend any tests to add

If you need more information to diagnose the issue, list specific questions. Think through this systematically before suggesting solutions.