Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the null and undefined errors pattern
Cannot read properties of undefined, NoneType has no attribute, NaN appearing from nowhere.
What went wrong: a blank form field is "", not None. is None lets "" through.
The fix: if not name: name = "guest"
Remember: for typed text, treat empty and missing the same way.
The pattern behind it: null and undefined errors.
Paste this into any web page or blog post. Visitors fix the bug right there, in their browser.
<iframe src="https://trybughunt.com/embed/ed03dd7e-7b01-4fbc-b139-ffffc88a1a34" title="Debugging challenge: Blank name gives an empty greeting" width="100%" height="580" loading="lazy" style="border:1px solid #d4d4d8;border-radius:12px;max-width:760px"></iframe>
<p style="font-size:14px">Debugging challenge from <a href="https://trybughunt.com/challenges/ed03dd7e-7b01-4fbc-b139-ffffc88a1a34">TryBugHunt</a></p>