CODEWITHSUNDEEP
flutterexceptionviewnavigator
Gianni Ottimista
Gianni Ottimista

Reputation: 43

Flutter: Exception using Navigator.of(context).pop();

Every time I use Navigator.of(context).pop(); to return to the previous view I always get the

Unhandled Exception: NoSuchMethodError: The method 'call' was called on null.

message.

However, the app successfully goes back to the previous view, but I don't know why I always get this message that sometimes causes a crash. What could it be?

#0      _rootRunUnary (dart:async/zone.dart:1198:47)
#1      _CustomZone.runUnary (dart:async/zone.dart:1100:19)
#2      _FutureListener.handleValue (dart:async/future_impl.dart:143:18)
#3      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:696:45)
#4      Future._propagateToListeners (dart:async/future_impl.dart:725:32)
#5      Future._completeWithValue (dart:async/future_impl.dart:529:5)
#6      Future._asyncCompleteWithValue.<anonymous closure> (dart:async/future_impl.dart:567:7)
#7      _rootRun (dart:async/zone.dart:1190:13)
#8      _CustomZone.run (dart:async/zone.dart:1093:19)
#9      _CustomZone.runGuarded (dart:async/zone.dart:997:7)
#10     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1037:23)
#11     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#12     _startMicrotaskLoop<…>

I usually use an Inkwell associated with an icon to call the method. In example:

InkWell(onTap: () => Navigator.of(context).pop(), 

  child: Icon(Icons.chevron_left_rounded, color: Constants.COLOR_DEF, size: 30));

Upvotes: 2

Views: 695

Answers (2)

Gianni Ottimista
Gianni Ottimista

Reputation: 43

Nevermind, found the problem.

Basically, when going from one page to another, I've always called "Navigator.of(context).push(new MaterialPageRoute)" passing also a callback function (if necessary). When that callback function is not passed (null) the error is thrown.

Thanks anyway to anyone who replied!

Upvotes: 2

Akshit Ostwal
Akshit Ostwal

Reputation: 469

this error usually arrives when the Navigator.of(context).currentState is null

which means you don't have any Route below current route, so you can't pop the route. Check this do you have any route below this route or not??

Upvotes: 0

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