fix: prevent crash when message.content is undefined in Anthropic API calls #10954
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- Add guard clause to check if message.content is undefined, null, or not an array - Prevents "Cannot read properties of undefined (reading filter)" error - Add comprehensive tests for edge cases (undefined, null, non-array, empty array) - Fixes issue reported in Reddit where Anthropic API calls would fail unexpectedly
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Review complete. No issues found. The implementation correctly adds a guard clause to handle Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues. |
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Closing this PR to investigate the root cause. The defensive fix treats the symptom (undefined content) rather than addressing why content is undefined in the first place, which violates the type contract. Will create a new PR after finding where malformed messages are being created. |
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Jan 25, 2026
…errors Root cause: JSON.parse() in readApiMessages() deserializes data with zero validation, allowing corrupted or legacy data to violate type contracts (e.g., undefined content). This causes downstream crashes in functions like filterNonAnthropicBlocks() that assume message.content is always string | ContentBlock[] per the type system, but receive undefined/null values from corrupted historical data. Solution: - Add validateApiMessage() to sanitize deserialized messages at the boundary - Fix undefined/null/non-array content by converting to empty array - Filter out malformed messages with invalid roles or non-object structure - Filter out invalid content blocks missing the required type field - Add comprehensive test coverage (12 tests covering all edge cases) Fixes: https://www.reddit.com/r/RooCode/s/yUXVFMYu3P Related to closed PR #10954 (which treated symptom, not cause)
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Fixes the "Cannot read properties of undefined (reading 'filter')" error reported in Reddit.
Problem
Users were experiencing API request failures when using Anthropic Claude models with the error:
The error occurred in
filterNonAnthropicBlocks()when attempting to filter message content that wasundefined,null, or not an array.Solution
Added a guard clause in
filterNonAnthropicBlocks()to check ifmessage.contentis:undefinednullIf any of these conditions are true, the message is filtered out gracefully rather than causing a crash.
Changes
filterNonAnthropicBlocks()Testing
All tests pass (13/13) including 4 new tests for edge cases.
View task on Roo Code Cloud
Important
Adds a guard clause in
filterNonAnthropicBlocks()to handleundefined,null, or non-arraymessage.content, preventing crashes and adding tests for these cases.filterNonAnthropicBlocks()inanthropic-filter.tsto handleundefined,null, or non-arraymessage.content.anthropic-filter.spec.tsfor edge cases:undefined,null, non-array, and empty array content.This description was created by
for 33687d9. You can customize this summary. It will automatically update as commits are pushed.