# Claude Code Extension not loading / initializing in Cursor **URL:** \ **Category:** Help\ **Created:** [October 14, 2025, 10:06am UTC](https://forum.cursor.com/t/claude-code-extension-not-loading-initializing-in-cursor/137321 "2025-10-14T10:06:40Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Alexander\_Movelidze](https://avatars.discourse-cdn.com/v4/letter/a/c4cdca/32.png) [@Alexander\_Movelidze](https://forum.cursor.com/u/Alexander_Movelidze)\ **Post date:** [October 14, 2025, 10:06am UTC](https://forum.cursor.com/t/claude-code-extension-not-loading-initializing-in-cursor/137321/1 "2025-10-14T10:06:40Z")
### Where does the bug appear (feature/product)? Cursor IDE ### Describe the Bug Hey everyone! Everything had been working perfectly for the past two months, but yesterday, when I tried to launch the Claude Code extension, I started getting this error: **Error: Claude Code process terminated by signal SIGABRT.** I couldn’t find any fix for this issue online. My system: macOS Big Sur 11.7.10 Cursor version: 1.7.46 VSCode version: 1.99.3 I tried reinstalling both Cursor and the extension with a full cleanup, but the issue still persists. The regular Claude Code CLI works fine. ### Steps to Reproduce Steps to reproduce: 1. Open Cursor 2. Enable the Claude Code extension 3. The error appears ### Screenshots / Screen Recordings ![Снимок экрана 2025-10-14 в 14.03.41.png](https://us1.discourse-cdn.com/cursor1/original/3X/0/2/025ba59b9d3c4b83041436f8cdd937ab09729e6c.jpeg) ### Operating System MacOS ### Current Cursor Version (Menu → About Cursor → Copy) Version: 1.7.46 VSCode Version: 1.99.3 Commit: b9e5948c1ad20443a5cecba6b84a3c9b99d62580 Date: 2025-10-14T01:21:46.830Z (8 hrs ago) Electron: 34.5.8 Chromium: 132.0.6834.210 Node.js: 20.19.1 V8: 13.2.152.41-electron.0 OS: Darwin x64 20.6.0 ### Does this stop you from using Cursor Yes - Cursor is unusable ---
**Author:** ![deanrie](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/deanrie/32/1263_2.png) [@deanrie](https://forum.cursor.com/u/deanrie)\ **Post date:** [October 14, 2025, 11:57am UTC](https://forum.cursor.com/t/claude-code-extension-not-loading-initializing-in-cursor/137321/2 "2025-10-14T11:57:14Z")
Hey, thanks for the report. It looks like the issue is with the Claude Code extension, not a Cursor bug. Please try: 1. If MCP calls might be involved, try disabling them and run Claude Code again 2. Temporary workaround: use the Claude Code CLI directly while waiting for a fix 3. Or disable the extension so it doesn’t affect your Cursor workflow, Cursor’s built-in AI features will keep working There’s a related GitHub issue, but no solution yet. I recommend tracking it: > > > \### Preflight Checklist > > \- \[x\] I have searched \[existing issues\](https://github.…com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet > \- \[x\] This is a single bug report (please file separate reports for different bugs) > \- \[x\] I am using the latest version of Claude Code > > \### What's Wrong? > > Claude Code crashes with SIGABRT during shutdown when attempting to terminate MCP (Model Context Protocol) servers. The crash occurs during the cleanup phase when the application cannot properly shut down connected MCP servers, leading to a Node.js assertion failure during stdio cleanup. > > \### What Should Happen? > > Claude Code should exit cleanly after properly terminating all MCP server processes and cleaning up resources. > > \### Error Messages/Logs > > \`\`\`shell > SIGINT failed, sending SIGTERM to MCP server process > Error sending SIGTERM: > SIGTERM failed, sending SIGKILL to MCP server process > Error sending SIGKILL: > Error terminating process: > Error closing client: > Cleanup timeout reached, stopping process monitoring > > Process terminates with SIGABRT and generates core dump (261MB core file). > \`\`\` > > \### Steps to Reproduce > > 1. Start Claude Code with MCP servers configured > 2. Use Claude Code normally (any operations) > 3. Exit Claude Code (Ctrl+C, quit command, or other exit method) > 4. Application crashes during shutdown process with core dump > > \### Claude Model > > Sonnet (default) > > \### Is this a regression? > > I don't know > > \### Last Working Version > > \_No response\_ > > \### Claude Code Version > > 1.0.113 > > \### Platform > > Anthropic API > > \### Operating System > > Ubuntu/Debian Linux > > \### Terminal/Shell > > VS Code integrated terminal > > \### Additional Information > > Stack trace analysis: > - Crash point: node::ResetStdio() during exit cleanup > - Signal: SIGABRT (assertion failure) > - Root cause: MCP servers failed to terminate (SIGINT → SIGTERM → SIGKILL all failed) > - Node.js cleanup assertion failed when trying to reset stdio during exit > > Technical details: > - Executable: /usr/bin/node (Claude Code) > - Core dump shows uncaught exception during shutdown sequence > - MCP server termination timeout reached before clean exit Since this isn’t a Cursor issue, it shouldn’t make Cursor itself unusable, only the Claude Code extension is affected. ---
**Author:** ![Alexander\_Movelidze](https://avatars.discourse-cdn.com/v4/letter/a/c4cdca/32.png) [@Alexander\_Movelidze](https://forum.cursor.com/u/Alexander_Movelidze)\ **Post date:** [October 15, 2025, 11:37am UTC](https://forum.cursor.com/t/claude-code-extension-not-loading-initializing-in-cursor/137321/3 "2025-10-15T11:37:30Z")
> [@deanrie](#): > > lease try: > > 1. If MCP calls might be involved, try disabling them and run Claude Code again > 2. Temporary workaround: use the Claude Code CLI directly while waiting for a fix > 3. Or disable the extension so it doesn’t affect your Cursor workflow, Cursor’s built-in AI features will keep working > > There’s a related GitHub issue, but no solution yet. I recommend tracking it: > > [[BUG] Claude Code crashes with SIGABRT during shutdown due to MCP server termination failure · Issue #7718 · anthropics/claude-code · GitHub](https://github.com/anthropics/claude-code/issues/7718) Hi, dearnie! Thank you so much for your help! I’ll be keeping an eye out for updates or a fix to the root issue. ---
**Author:** ![system](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/system/32/99069_2.png) [@system](https://forum.cursor.com/u/system)\ **Post date:** [November 6, 2025, 11:37am UTC](https://forum.cursor.com/t/claude-code-extension-not-loading-initializing-in-cursor/137321/4 "2025-11-06T11:37:31Z")
This topic was automatically closed 22 days after the last reply. New replies are no longer allowed.