Check the extension host process

Oct 13, 2025 by wbrum.org 46 views

Introduction

Cline is a powerful tool for developers, providing a seamless experience for coding and debugging. However, like any software, it can encounter issues that hinder its performance. In this article, we will delve into a specific problem where the Cline window blinks a couple of times and then goes blank upon opening a specific session.

What Happened?

When opening a specific session, the Cline window blinks a couple of times and then goes blank. This issue is not only frustrating but also disrupts the workflow of developers relying on Cline for their daily tasks.

Steps to Reproduce

Unfortunately, the steps to reproduce this issue are unknown. However, a Cline log has been attached, which may provide valuable insights into the problem. The log can be found in the following link: cline_task_mar-9-2025_1-03-15-pm.md.zip.

Operating System

The issue was encountered on a MacOS system.

Cline Version

The version of Cline being used is 3.6.7.

Additional Context

Dev tools are showing a ton of errors from the plugin, which may be related to the issue. The errors are as follows:

log.ts:456   ERR [Extension Host] Error checking if URL is an image: http://0.0.0.0:8025. TypeError: Invalid URL
	at new URL (node:internal/url:806:29)
	at /Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:802:5035
	at /Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:802:4023
	at new Promise (<anonymous>)
	at u7n (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:802:3927)
	at http (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:802:4274)
	at mM.Nce (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:804:518)
	at mM._request (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:805:1454)
	at mM.request (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:804:1972)
	at mM.<computed> [as head] (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:805:1778)
	at Function.head (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:799:7066)
	at N9r (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:927:2789)
	at t.checkIsImageUrl (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:2598:11922)
	at Th.value (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:2589:3384)
	at P.B (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2375)
	at P.fire (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2593)
	at xB.$onMessage (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:135:90266)
	at qy.S (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:116244)
	at qy.Q (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:116024)
	at qy.M (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:115113)
	at qy.L (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:114351)
	at Th.value (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:113015)
	at P.B (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2375)
	at P.fire (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2593)
	at Gn.fire (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:9459)
	at Th.value (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:190:13324)
	at P.B (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2375)
	at P.fire (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2593)
	at Gn.fire (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:9459)
	at MessagePortMain.<anonymous> (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:190:11616)
	at MessagePortMain.emit (node:events:518:28)
	at MessagePortMain.emit (node:domain:489:12)
	at MessagePortMain._internalPort.emit (node:electron/js2c/utility_init:2:2949)
	at Object.topLevelDomainCallback (node:domain:161:15)
	at Object.callbackTrampoline (node:internal/async_hooks:128:24)
	at mM.request (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:804:2057)
	at async N9r (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:927:2780)
	at async t.checkIsImageUrl (/Users/nowaker/.vscode/extensions/saoudrizwan.claude-dev-3.6.7/dist/extension.js:2598:11916)

Possible Causes

Based on the error messages, it appears that there may be an issue with the plugin or the extension host process. The error messages suggest that there is a problem with checking if a URL is an image, which may be related to the issue.

Troubleshooting Steps

To troubleshoot this issue, we can try the following steps:

Check the plugin: Check if the plugin is up-to-date and if there are any known issues with it.
Check the extension host process: Check if the extension host process is running correctly and if there are any issues with it.
Check the URL: Check if the URL being checked is valid and if it is an image.
Check the Cline log: Check the Cline log for any errors or issues that may be related to the problem.

Conclusion

Q: What is the Cline window blinks a couple of times and then goes blank issue?

A: The Cline window blinks a couple of times and then goes blank issue is a problem where the Cline window blinks a couple of times and then goes blank upon opening a specific session.

Q: What are the possible causes of this issue?

A: The possible causes of this issue are:

Plugin issue: The plugin may be causing the issue.
Extension host process issue: The extension host process may be causing the issue.
URL issue: The URL being checked may be invalid or not an image.
Cline log issue: The Cline log may contain errors or issues that are related to the problem.

Q: How can I troubleshoot this issue?

A: To troubleshoot this issue, you can try the following steps:

Check the plugin: Check if the plugin is up-to-date and if there are any known issues with it.
Check the extension host process: Check if the extension host process is running correctly and if there are any issues with it.
Check the URL: Check if the URL being checked is valid and if it is an image.
Check the Cline log: Check the Cline log for any errors or issues that may be related to the problem.

Q: How can I fix this issue?

A: To fix this issue, you can try the following steps:

Update the plugin: Update the plugin to the latest version.
Restart the extension host process: Restart the extension host process.
Check the URL: Check if the URL being checked is valid and if it is an image.
Check the Cline log: Check the Cline log for any errors or issues that may be related to the problem.

Q: What are the common symptoms of this issue?

A: The common symptoms of this issue are:

Cline window blinks a couple of times and then goes blank: The Cline window blinks a couple of times and then goes blank upon opening a specific session.
Error messages: Error messages may appear in the Cline log or in the extension host process.
Plugin or extension host process issues: The plugin or extension host process may be causing the issue.

Q: How can I prevent this issue from happening in the future?

A: To prevent this issue from happening in the future, you can try the following steps:

Regularly update the plugin: Regularly update the plugin to the latest version.
Monitor the extension host process: Monitor the extension host process for any issues or errors.
Check the URL: Check if the URL being checked is valid and if it is an image.
Check the Cline log: Check the Cline log for any errors or issues that may be related to the problem.

Q: What are the best practices for troubleshooting this issue?

A: The best practices for troubleshooting this issue are:

Gather information: Gather as much information as possible about the issue, including error messages and system logs.
Isolate the problem: Isolate the problem by trying to reproduce it in a controlled environment.
Check for known issues: Check for known issues with the plugin or extension host process.
Seek help: Seek help from the plugin or extension host process developers or from online communities.