# panic: close of closed channel

- **ID:** `go/panic-close-of-closed-channel`
- **Domain:** go
- **Category:** runtime_error
- **Verification:** official
- **Fix Rate:** 80%

## Root Cause

Closing a channel that is already closed. Check if channel is closed before calling close().

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.x | active | — | — |