No composer data handle found

Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

no composer data handle found

Steps to Reproduce

Select a pre-existing chat

Expected Behavior

chat displays

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.1.19
VSCode Version: 1.105.1
Commit: 39a966b4048ef6b8024b27d4812a50d88de29cc0
Date: 2025-11-21T22:59:02.376Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 25.2.0

Does this stop you from using Cursor

No - Cursor works, but with this issue

2

Hey, thanks for the report. This looks like a known Composer data integrity issue.

To confirm the diagnosis, please check the Console tab for errors:

  • CMD+Shift+P → “Developer: Toggle Developer Tools”
  • Click the “Console” tab
  • Try selecting the problematic chat again
  • Share any errors that appear

Important to know:

  • Chat history is stored locally (not in the cloud), so recovery options are limited once corruption occurs.
  • New chats should work normally.
  • Don’t delete the affected chat yet, it may be recoverable after investigation.

Going forward:

  • Export important chats regularly: click the three dots at the top of the chat → Export Chat.
  • Consider using the SpecStory extension for automatic chat backups.
  • Make sure you have enough free disk space before updates, since low disk space is the most common cause of these issues.

Let me know what errors you see in the console.

3

ERR A view with id ‘workbench.panel.aichat.view.d528b005-16ea-4416-852b-cb214ff74d28’ is already registered: Error: A view with id ‘workbench.panel.aichat.view.d528b005-16ea-4416-852b-cb214ff74d28’ is already registered
at UTl.addViews (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:542:313349)
at vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:542:311983
at Array.forEach ()
at UTl.registerViews2 (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:542:311941)
at UTl.registerViews (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:542:311877)
at Mao.swapComposerPaneView (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7204:35936)
at Mao.swapComposerView (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7204:36633)
at _C.openComposerImpl (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7163:12373)
at async _C.openComposer (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7163:10803)
at async Y (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:6170:29497) Error: A view with id ‘workbench.panel.aichat.view.d528b005-16ea-4416-852b-cb214ff74d28’ is already registered
at UTl.addViews (workbench.desktop.main.js:542:313349)
at workbench.desktop.main.js:542:311983
at Array.forEach ()
at UTl.registerViews2 (workbench.desktop.main.js:542:311941)
at UTl.registerViews (workbench.desktop.main.js:542:311877)
at Mao.swapComposerPaneView (workbench.desktop.main.js:7204:35936)
at Mao.swapComposerView (workbench.desktop.main.js:7204:36633)
at _C.openComposerImpl (workbench.desktop.main.js:7163:12373)
at async _C.openComposer (workbench.desktop.main.js:7163:10803)
at async Y (workbench.desktop.main.js:6170:29497)