LateInitializationError for MapState in map.dart

[SebastianEngel]

I just upgraded to version 0.13.1 which solved already some LateInitializationErrors.

Unfortunately I just found another one in map.dart.

late final MapState _state;

which is final but can be set to another value again:

set state(MapState state) {
  _state = state;
  if (!_readyCompleter.isCompleted) {
    _readyCompleter.complete();
  }
}

[kengu]

Manually tested all features in the example app without hitting this error. So I don't think it is a bug that is hit often?

[Ciock]

I keep encountering this problem too

[jexme]

I confirm, this problem also constantly arises

LateInitializationError: Field '_state @ 1495051772' has already been initialized

[ibrierley]

Can anyone do a minimal example to reproduce ? It would be good to know what circumstances create it.

[jexme]

Can anyone do a minimal example to reproduce ? It would be good to know what circumstances create it.

I have a problem when I pass the mapController, if not pass it - no problem.

The error occurs when assigning state to mapController (flutter_map-0.13.1 / lib / src / map / flutter_map_state.dart: 41)

Screen of data at the first entry (no errors):

Screen of data on subsequent visits, after this error:

stack:

#0      LateError._throwFieldAlreadyInitialized (dart:_internal-patch/internal_patch.dart:203:5)
#1      MapControllerImpl._state= (package:flutter_map/src/map/map.dart:16:23)
#2      MapControllerImpl.state= (package:flutter_map/src/map/map.dart:26:5)
#3      FlutterMapState.initState (package:flutter_map/src/map/flutter_map_state.dart:41:19)
#4      StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4711:57)
#5      ComponentElement.mount (package:flutter/src/widgets/framework.dart:4548:5)
#6      Element.inflateWidget (package:flutter/src/widgets/framework.dart:3611:14)
#7      Element.updateChild (package:flutter/src/widgets/framework.dart:3360:20)
#8      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4599:16)
#9      StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4746:11)
#10     Element.rebuild (package:flutter/src/widgets/framework.dart:4267:5)
#11     StatefulElement.update (package:flutter/src/widgets/framework.dart:4778:5)
#12     Element.updateChild (package:flutter/src/widgets/framework.dart:3350:15)
#13     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4599:16)
#14     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4746:11)
#15     Element.rebuild (package:flutter/src/widgets/framework.dart:4267:5)
#16     BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2582:33)
#17     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:875:21)
#18     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:328:5)
#19     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
#20     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1082:9)
#21     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:998:5)
#22     _rootRun (dart:async/zone.dart:1354:13)
#23     _CustomZone.run (dart:async/zone.dart:1258:19)
#24     _CustomZone.runGuarded (dart:async/zone.dart:1162:7)
#25     _invoke (dart:ui/hooks.dart:163:10)
#26     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:259:5)
#27     _drawFrame (dart:ui/hooks.dart:126:31)

[ibrierley]

Is this happening after navigation return or something, and the mapController isn't getting reset whilst the map is maybe ?

…

On Wed, Jun 9, 2021 at 3:03 PM Aleksey Sannikov ***@***.***> wrote: Can anyone do a minimal example to reproduce ? It would be good to know what circumstances create it. I have a problem when I pass the mapController, if not pass it - no problem. The error occurs when assigning state to mapController (flutter_map-0.13.1 / lib / src / map / flutter_map_state.dart: 41) Screen of data at the first entry (no errors): [image: image] <https://user-images.githubusercontent.com/22722008/121369024-91751900-c94c-11eb-82da-5b0e6d26dbd6.png> Screen of data on subsequent visits, after this error: [image: image] <https://user-images.githubusercontent.com/22722008/121369135-a6ea4300-c94c-11eb-8d70-99acf340f127.png> stack: #0 LateError._throwFieldAlreadyInitialized (dart:_internal-patch/internal_patch.dart:203:5) #1 MapControllerImpl._state= (package:flutter_map/src/map/map.dart:16:23) #2 MapControllerImpl.state= (package:flutter_map/src/map/map.dart:26:5) #3 FlutterMapState.initState (package:flutter_map/src/map/flutter_map_state.dart:41:19) #4 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4711:57) #5 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4548:5) #6 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3611:14) #7 Element.updateChild (package:flutter/src/widgets/framework.dart:3360:20) #8 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4599:16) #9 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4746:11) #10 Element.rebuild (package:flutter/src/widgets/framework.dart:4267:5) #11 StatefulElement.update (package:flutter/src/widgets/framework.dart:4778:5) #12 Element.updateChild (package:flutter/src/widgets/framework.dart:3350:15) #13 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4599:16) #14 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4746:11) #15 Element.rebuild (package:flutter/src/widgets/framework.dart:4267:5) #16 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2582:33) #17 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:875:21) #18 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:328:5) #19 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15) #20 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1082:9) #21 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:998:5) #22 _rootRun (dart:async/zone.dart:1354:13) #23 _CustomZone.run (dart:async/zone.dart:1258:19) #24 _CustomZone.runGuarded (dart:async/zone.dart:1162:7) #25 _invoke (dart:ui/hooks.dart:163:10) #26 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:259:5) #27 _drawFrame (dart:ui/hooks.dart:126:31) — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#926 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA5YN5IN5ALYDGVSILBHJCTTR5YDTANCNFSM46JL6QUA> .

[jexme]

@ibrierley in my case it happens after removing the marker (for further rendering of the new marker), which shows the current location

I redraw the map constantly, when new geolocation data comes in, it turns out that the layers are just updating

return FlutterMap(
  options: MapOptions(
    minZoom: minZoom,
    maxZoom: maxZoom,
    center: currentPosition.latLng,
  ),
  layers: _layerOptions,
  mapController: mapController,
);

[ibrierley]

That sounds weird, well, as mentioned, if someone can produce a test case to highlight it (so it can be known if its fixed or not), it would be useful.

[kuhnroyal]

This happens when you pass a mapController to FlutterMap and the widget tree changes in a way that the map state can not be found again after the change or you cause it manually by using a key on FlutterMap.

My case is something like this:

        FlutterMap(
          key: ValueKey(MediaQuery.of(context).orientation),
          mapController: mapController,
       )

The MapState is recreated when the orientation changes but the controller stays the same and is already initialized.

[jexme]

In my case, I found the problem. I got a problem when I was adding a route (updated layers). Before adding the route, I called the CircularProgressIndicator display, thereby destroying the FlitterMap, and then re-creating the map. Perhaps I created a new map until the previous one had time to pass the destruction, but this is just an assumption.

As a result, I think that this is my problem.

[kuhnroyal]

@jexme In your case the widget tree changes probably also lead to the state being re-created.
The controller should be able to be used with different instances of FlutterMap.

[Ciock]

Any news on this issue? I'm stuck with null safety update and this bug.

[ibrierley]

Can you post a minimal example highlighting the problem so it can be reproduced ?

[kuhnroyal]

Can you post a minimal example highlighting the problem so it can be reproduced ?

I already posted this, just add the key and turn the device on the side.

        FlutterMap(
          key: ValueKey(MediaQuery.of(context).orientation),
          mapController: mapController,
       )

[ibrierley]

Does switching "late final MapState _state;" for "late MapState _state;" in map.dart fix it ?