Unexpected null value

[lukas-h]

errors.dart:251 Uncaught (in promise) Error: Unexpected null value.
    at Object.throw_ [as throw] (errors.dart:251:49)
    at Object.nullCheck (operations.dart:528:63)
    at mapbox_widget_layer.dart:175:52
    at _RootZone.runUnary (zone.dart:1685:54)
    at _FutureListener.then.handleValue (future_impl.dart:147:18)
    at handleValueCallback (future_impl.dart:766:44)
    at _Future._propagateToListeners (future_impl.dart:795:13)
    at [_completeWithValue] (future_impl.dart:566:5)
    at async._AsyncCallbackEntry.new.callback (future_impl.dart:639:7)
    at Object._microtaskLoop (schedule_microtask.dart:40:11)
    at _startMicrotaskLoop (schedule_microtask.dart:49:5)
    at async_patch.dart:166:15

_mapController.toScreenLocationBatch(coordinates).then((points) {
      var cameraPos = _mapController.cameraPosition!; // <--- !!! HERE !!!
      _markerStates.asMap().forEach((i, value) {