setState() or markNeedsBuild() called during build Flutter / Dart Origin: On your device Last updated 4 Nov 2026

Flutter: setState() or markNeedsBuild() called during build. This widget cannot be marked as needing to build because the framework is already in the process of building widgets

State was changed while Flutter was building widgets, for example calling setState or a notifier from inside build.

Exact message you may see setState() or markNeedsBuild() called during buildThis widget cannot be marked as needing to build because the framework is already in the process of building widgetssetState() called during buildnotifyListeners() was called during buildTried to build dirty widget in the wrong build scope
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Seen on: Flutter

Meaning

Calling setState, notifyListeners() or navigation inside build triggers another build mid-build. Move the work to initState, a post-frame callback (WidgetsBinding.instance.addPostFrameCallback), or an event handler. With Provider, defer notifications triggered from build.

Common causes

  • setState() or notifyListeners() called in build()
  • Navigator.push in build
  • Provider notifier updated during a child's build
  • Controller listener calling setState while building
  • FutureBuilder/StreamBuilder callback that mutates state

⚡ Quick fix

  1. Move the call to initState or an event handler
  2. Wrap in WidgetsBinding.instance.addPostFrameCallback((_) { … })
  3. Use Future.microtask for provider updates started in build

Detailed fix by platform

Flutter

  1. WidgetsBinding.instance.addPostFrameCallback((_) { if (mounted) setState(() => ready = true); });

How to diagnose

  1. Call — setState/notifyListeners in build?
  2. Trigger — Navigation/provider?
  3. Timing — Need post-frame?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: On your device. Errors that are often confused with or caused by this one (click to open):

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