go runtime_error ai_generated true

panic: runtime error: index out of range

ID: go/panic-runtime-error

Also available as: JSON · Markdown
92%Fix Rate
92%Confidence
50Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1 active — — —

Root Cause

Array/slice index out of bounds. Go panics instead of returning error.

generic

Workarounds

  1. 95% success Add bounds check before accessing: if i < len(slice) { ... } 
    if i < len(slice) { ... }

    Sources: https://go.dev/ref/spec#Index_expressions

  2. 90% success Use range loop instead of index-based loop to avoid off-by-one 
    for i, v := range slice { ... }

    Sources: https://go.dev/ref/spec#For_range

Dead Ends

Common approaches that don't work:

  1. Use recover() to catch all panics 80% fail

    Silences the bug — index out of range means logic error

  2. Pre-allocate a larger slice 70% fail

    Doesn't fix the incorrect index logic

Error Chain

Frequently confused with: