[BUG] JetBrains extension fails to initialize ACP session - "Query closed before response received"

Preflight Checklist

• [x] I have searched existing issues 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?

Description:
Environment:

Claude Code version: v2.1.84
IDE: JetBrains (WebStorm)
OS: Windows

Problem:
JetBrains extension fails to initialize with error:
Failed to initialize ACP process. Process terminated with exit code: 1.
Error handling request {
type: 'com.agentclientprotocol.rpc.JsonRpcRequest',
id: 3,
method: 'session/new',
params: { cwd: 'C:\\Users\\test\\e2e-aos', mcpServers: [] },
jsonrpc: '2.0'
} {
code: -32603,
message: 'Internal error',
data: { details: 'Query closed before response received' }
}
Expected behavior:
Extension initializes successfully and AI Chat panel works in the IDE sidebar.
Actual behavior:
Extension shows error in AI Chat panel. Claude Code works fine via terminal with the same project.
Workaround:
Works via terminal after setting:
powershell$env:CLAUDE_CODE_GIT_BASH_PATH = "C:\Users\test\AppData\Local\Programs\Git\bin\bash.exe"
claude

What Should Happen?

Expected behavior:
Extension initializes successfully and AI Chat panel works in the IDE sidebar.
Actual behavior:
Extension shows error in AI Chat panel. Claude Code works fine via terminal with the same project.
Workaround:
Works via terminal after setting:
powershell$env:CLAUDE_CODE_GIT_BASH_PATH = "C:\Users\test\AppData\Local\Programs\Git\bin\bash.exe"
claude

Error Messages/Logs

Description:
Environment:

Claude Code version: v2.1.84
IDE: JetBrains (WebStorm)
OS: Windows

Problem:
JetBrains extension fails to initialize with error:
Failed to initialize ACP process. Process terminated with exit code: 1.
Error handling request {
  type: 'com.agentclientprotocol.rpc.JsonRpcRequest',
  id: 3,
  method: 'session/new',
  params: { cwd: 'C:\\Users\\test\\e2e-aos', mcpServers: [] },
  jsonrpc: '2.0'
} {
  code: -32603,
  message: 'Internal error',
  data: { details: 'Query closed before response received' }
}

Steps to Reproduce

Description:
Environment:

Claude Code version: v2.1.84
IDE: JetBrains (WebStorm)
OS: Windows

Problem:
JetBrains extension fails to initialize with error:
Failed to initialize ACP process. Process terminated with exit code: 1.
Error handling request {
type: 'com.agentclientprotocol.rpc.JsonRpcRequest',
id: 3,
method: 'session/new',
params: { cwd: 'C:\\Users\\test\\e2e-aos', mcpServers: [] },
jsonrpc: '2.0'
} {
code: -32603,
message: 'Internal error',
data: { details: 'Query closed before response received' }
}

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.84

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_