# panic: assignment to entry in nil map

- **ID:** `go/panic-assignment-to-entry-in-nil-map`
- **Domain:** go
- **Category:** type_error
- **Verification:** official
- **Fix Rate:** 80%

## Root Cause

Writing to a map that was declared but not initialized with make(). A nil map cannot store values.

## Version Compatibility

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