python runtime_error ai_generated true

jinja2.exceptions.UndefinedError: 'user' is undefined

ID: python/jinja2-undefined-user

Also available as: JSON · Markdown · 中文
80%Fix Rate
86%Confidence
0Evidence
2024-05-02First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Template references a variable that was not passed to render_template or is missing from the context dict.

generic

中文

模板引用了未传给 render_template 或上下文字典中缺失的变量。

Workarounds

  1. 95% success 
    return render_template('profile.html', user=current_user)
  2. 85% success 
    app.jinja_env.undefined = jinja2.StrictUndefined

Dead Ends

Common approaches that don't work:

  1. 80% fail

    Silently renders empty output instead of surfacing the missing data.

  2. 70% fail

    Hides the real problem and breaks required logic.