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TypeError: undefined is not an object (evaluating 'toSummarize.at(-1).info') #2559
Description
Description
A TypeError: undefined is not an object (evaluating 'toSummarize.at(-1).info') occurs during session summarization when attempting to create issue content.
Steps to Reproduce
- Trigger session summarization in scenarios where there are 0 or 1 messages after the last summary message.
- The error occurs at line 1826 in
packages/opencode/src/session/index.tswhen accessingtoSummarize.at(-1).info.time.created.
Expected Behavior
Session summarization should handle cases with no messages to summarize gracefully without throwing an error.
Actual Behavior
The application throws a TypeError because toSummarize is an empty array, and at(-1) returns undefined.
Root Cause
The summarize function assumes toSummarize (a slice of messages) is non-empty, but it can be empty when msgs.length - start is 0 or 1, leading to an empty slice.
Environment
- Platform: Linux
- Opencode version: 0.7.3
Additional Context
This error prevents proper session compaction and interrupts user workflows
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github-actions commentedon Sep 12, 2025
This issue might be a duplicate or related to existing issues. Please check:
/compactis not interruptable #606: Problems with compact command interruption (closed, but related to compaction functionality)The error you're experiencing seems to be in the summarization logic during session compaction. While not exact duplicates, these issues all relate to problems with the compaction/summarization system.
Feel free to ignore if none of these address your specific case.
vldF commentedon Sep 12, 2025
I have this too
thdxr commentedon Sep 12, 2025
should be fixed now