Extension Crashes on each chat message post (e is not iterable)

[stevehaneytrailblazer]

When posting any message in copilot chat it will take about 2-5 seconds for the message to actually appear as posted in the chat. During this lag the Copilot chat extension seems to crash and restart. See logs for what I can see in VSC Extension Host Output .

• Copilot Chat Extension Version: 0.38.1
• VS Code Version: 1.110.0 (Universal)
• OS Version: Mac Tahoe 26.3 (25D125)
• Feature (e.g. agent/edit/ask mode): Chat
• Selected model (e.g. GPT 4.1, Claude 3.7 Sonnet): Claude Sonnet 4.6
• Logs:

TypeError: e is not iterable
	at NTe.setItems (/Users/xxx/.vscode/extensions/github.copilot-chat-0.38.1/dist/extension.js:1065:19954)
	at hd._computeFn (/Users/xxx/.vscode/extensions/github.copilot-chat-0.38.1/dist/extension.js:1065:19693)
	at hd._recompute (/Users/xxx/.vscode/extensions/github.copilot-chat-0.38.1/dist/extension.js:1065:11922)
	at hd.get (/Users/xxx/.vscode/extensions/github.copilot-chat-0.38.1/dist/extension.js:1065:11256)
	at hd.reportChanges (/Users/xxx/.vscode/extensions/github.copilot-chat-0.38.1/dist/extension.js:1065:497)
	at PTe.endUpdate (/Users/xxx/.vscode/extensions/github.copilot-chat-0.38.1/dist/extension.js:1065:19452)
	at Mjt (/Users/xxx/.vscode/extensions/github.copilot-chat-0.38.1/dist/extension.js:1065:19170)
	at hd.recomputeInitiallyAndOnChange (/Users/xxx/.vscode/extensions/github.copilot-chat-0.38.1/dist/extension.js:1065:1092)
	at OT.init (/Users/xxx/.vscode/extensions/github.copilot-chat-0.38.1/dist/extension.js:2672:1654)
	at Timeout._onTimeout (/Users/xxx/.vscode/extensions/github.copilot-chat-0.38.1/dist/extension.js:1027:12)
	at listOnTimeout (node:internal/timers:588:17)
	at process.processTimers (node:internal/timers:523:7)```

Steps to Reproduce:

1.   Anytime I submit a message in the Copilot chat it hangs and then the extensions restart
2.  Eventually it restores the chat checkpoint and copilot responds but its laggy and crashing on every post.

[stevehaneytrailblazer]

Do the logs on this help at all?

[stevehaneytrailblazer]

I reverted to VSC 1.109.5 (Universal) and copilot 0.37.9 (from visx) which no longer has the issue. This was introduced in v38

[justschen]

usually this happens when there is a mistmatch between version updates - are you seeing this on the latest versions for both the extension and vs code?

[stevehaneytrailblazer]

Yes, I was upgraded to the latest Copilot Chat Extension Version: 0.38.1 and VS Code Version: 1.110.0 (Universal) when I saw this behavior start.