fix: add validation to mixpanel for invalid context

[ItsSudip]

What are the changes introduced in this PR?

Added one check for validating if the context is defined for an identify call or not.

What is the related Linear task?

Resolves INT-6054

Please explain the objectives of your changes below

Put down any required details on the broader aspect of your changes. If there are any dependent changes, mandatorily mention them here

Any changes to existing capabilities/behaviour, mention the reason & what are the changes ?

N/A

Any new dependencies introduced with this change?

N/A

Any new generic utility introduced or modified. Please explain the changes.

N/A

Any technical or performance related pointers to consider with the change?

N/A

@coderabbitai review

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Developer checklist

• My code follows the style guidelines of this project

• No breaking changes are being introduced.

• All related docs linked with the PR?

• All changes manually tested?

• Any documentation changes needed with this change?

• Is the PR limited to 10 file changes?

• Is the PR limited to one linear task?

• Are relevant unit and component test-cases added in new readability format?

Reviewer checklist

• Is the type of change in the PR title appropriate as per the changes?

• Verified that there are no credentials or confidential data exposed with the changes.

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Walkthrough

Added defensive null/undefined checks to context access in the Mixpanel transformation logic by implementing optional chaining (message.context?.traits) and a guard condition before assigning context traits, improving robustness without changing core behavior.

Changes

Cohort / File(s)	Summary
Defensive Context Handling src/v0/destinations/mp/transform.js	Replaced direct property access with optional chaining for message.context.traits and added guard to ensure message.context exists before assignment. Prevents potential undefined reference errors.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description check	✅ Passed	The PR description follows the template structure and covers required sections. However, the developer checklist items remain unchecked and the description is concise but somewhat minimal in detail.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title accurately summarizes the main change: adding validation for undefined context in Mixpanel's transform logic, which directly corresponds to the code modifications shown in the changeset.

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✨ Finishing Touches

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• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/mixpanel

📝 Coding Plan

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.29%. Comparing base (d281d8f) to head (eb6fdf5).
⚠️ Report is 1 commits behind head on hotfix/16hMar2026.

Additional details and impacted files

@@                  Coverage Diff                  @@
##           hotfix/16hMar2026    #5040      +/-   ##
=====================================================
- Coverage              92.32%   92.29%   -0.03%     
=====================================================
  Files                    657      659       +2     
  Lines                  36139    36067      -72     
  Branches                8531     8499      -32     
=====================================================
- Hits                   33365    33288      -77     
+ Misses                  2557     2541      -16     
- Partials                 217      238      +21     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud