182 articles tagged #Debugging
Your SUMIFS formula looks right, but the moment you point a criteria range or criteria value at another sheet, it returns zero. Here's why that happens and exactly how to fix it.
TEXTJOIN returning an empty string when your range contains blank cells is one of Excel's more confusing silent failures. Here's exactly why it happens and how to fix it without restructuring your data.
Feature flags in multi-tenant SaaS apps can silently bleed settings between customers — enabling features for tenants who shouldn't have them or disabling paid features mid-session. Here's where the isolation breaks and how to fix it.
Your COUNTIF formula looks right, but the count is off when you use wildcards. Learn exactly why asterisks and question marks mislead COUNTIF — and how to fix every common case.
Your SUMIFS total looks suspiciously high and you can't figure out why. Misaligned sum and criteria ranges are the most common culprit — and Excel won't warn you. Here's how to diagnose and fix it.
ChatGPT can scaffold logging middleware in seconds, but the default output often silences exceptions instead of surfacing them. Here's how to prompt your way to middleware that actually preserves error context.
Deployed your stack and CloudWatch alarms won't move past INSUFFICIENT_DATA? This guide breaks down every real cause — from missing metric namespaces to IAM gaps — and shows you exactly how to fix each one.
IFERROR is supposed to be a safety net, but wrap it around the wrong formula and it silently swallows genuine mistakes while handing you bad data. Here's how to diagnose the problem and fix it properly.
Your VLOOKUP formula looks perfect, the value is right there in the table, yet Excel still throws #N/A. Nine times out of ten, trailing spaces in your source data are the culprit — here's how to find and fix them fast.
PostgreSQL 12 changed how CTEs are handled, and the difference between materialized and inlined CTEs can silently kill your query performance. Here's how to diagnose the problem and fix it with one keyword.
AI agents can scaffold an entire feature in minutes, which feels like magic until it ships. Here's where vibe coding quietly falls apart in real production systems and what to do about it.
xlsxwriter silently drops or corrupts hyperlinks when the display text exceeds 255 characters. Learn exactly why this limit exists, how to detect it, and three practical workarounds you can ship today.