package:flutter/src/widgets/navigator.dart': Failed assertion: line 5295 pos 12: '!_debugLocked': is not true

[rt234cw]

Flushbar(        title: 'title',
                  message: 'ok',
                  flushbarPosition: FlushbarPosition.TOP,
                  duration: const Duration(seconds: 2),
                  animationDuration: Duration.zero,
                ).show(context);

While trying to disable animation by setting animationDuration : Duration.zero caused the exception
package:flutter/src/widgets/navigator.dart': Failed assertion: line 5295 pos 12: '!_debugLocked': is not true

Had searched for solution, however, I couldn't find one. Is there a solution of this issue?

[incrediblezayed]

Just put up await it will fix it up

[Maxibond]

Raise up this.
Generally, I don't want to have animations, so I put 0 as it seems logical to me.
But it breaks navigation, as I will not be able to use navigator.pop() -> it will try to remove /flushbarRoute instead