Segment Duplicate Events

How to fix it

Try these in order — the most common fix is first.

1. 1. Filter by library

   Copy steps
   1. Create a destination filter that drops events where context.library.name is the browser library
   2. Keep the server-side copy
   Did this fix it? Yes No

2. 2. Load analytics once

   Copy steps
   1. Search your code for two snippets or two write keys
   2. Use a single instance and set the write key conditionally per environment
   Did this fix it? Yes No

3. 3. Avoid parallel sending

   1. Disable the native destination SDK if Segment already forwards the event
   Did this fix it? Yes No

4. 4. Fix SPA page calls

   1. Fire page() once per route change, not in a component that re-renders
   Did this fix it? Yes No

Symptoms

The same event appears twice in the destination or warehouse.

Why it happens

• Browser and server both send the same track call
• Analytics snippet loaded twice or npm plus snippet
• Segment and the destination SDK both send the event
• Page calls firing on every SPA route re-render

This guide also covers

• segment duplicate events
• segment duplicate page calls
• segment events firing twice

Other Segment errors

• Segment Events Not Showing in Debugger
• Segment Events Not Reaching Destination
• Segment Analytics.js Blocked by Ad Blockers
• Segment Analytics.js Not Loading
• Segment Protocols Blocking Events
• Segment Workspace Locked on Free Plan
• Segment Charged After Downgrading
• Segment Destination Delivery Failures (4xx Errors)