Encountering a Cannot read properties of undefined (reading ‘H’) error in your Next.js application, especially within the App Router, can be puzzling. This cryptic message often points to a fundamental…
Next.js App Router
How to Fix: `useSelectedLayoutSegment` not working correctly in parallel routes.
Table of Contents Understanding the Root Cause Step-by-Step Solution 1. Correct Usage Within Parallel Routes 2. Inferring Parallel Route State from a Parent Common Edge Cases FAQ The useSelectedLayoutSegment hook…