PostHog Common Errors

Overview

Diagnosis and solutions for the most common PostHog integration errors. Covers event capture failures, authentication issues, feature flag problems, identity fragmentation, and SDK initialization errors.

Prerequisites

• PostHog SDK installed (posthog-js or posthog-node)
• Access to browser console or server logs
• PostHog project API key (phc_...) available

Instructions

Tool discipline

Use Read to inspect the relevant configuration and implementation before proposing changes. Use Grep to locate initialization, capture, flag, and credential boundaries.

Error 1: Events Not Appearing in Dashboard