E/flutter ( 9650): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The method '*' was called on null.
E/flutter ( 9650): Receiver: null
E/flutter ( 9650): Tried calling: *(1000)
E/flutter ( 9650): #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
E/flutter ( 9650): #1      GeoFireCollectionRef.within.<anonymous closure>.<anonymous closure> (package:geoflutterfire/src/collection.dart:131:26)
E/flutter ( 9650): #2      Sort._insertionSort (dart:_internal/sort.dart:71:36)
E/flutter ( 9650): #3      Sort._doSort (dart:_internal/sort.dart:60:7)
E/flutter ( 9650): #4      Sort.sort (dart:_internal/sort.dart:35:5)
E/flutter ( 9650): #5      ListMixin.sort (dart:collection/list.dart:341:10)
E/flutter ( 9650): #6      GeoFireCollectionRef.within.<anonymous closure> (package:geoflutterfire/src/collection.dart:128:20)
E/flutter ( 9650): #7      _MapStream._handleData (dart:async/stream_pipe.dart:229:21)
E/flutter ( 9650): #8      _ForwardingStreamSubscription._handleData (dart:async/stream_pipe.dart:166:13)
E/flutter ( 9650): #9      _rootRunUnary (dart:async/zone.dart:1134:38)
E/flutter ( 9650): #10     _CustomZone.runUnary (dart:async/zone.dart:1031:19)
E/flutter ( 9650): #11     _CustomZone.runUnaryGuarded (dart:async/zone.dart:933:7)
E/flutter ( 9650): #12     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter ( 9650): #13     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:266:7)
E/flutter ( 9650): #14     _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:773:19)
E/flutter ( 9650): #15     _StreamController._add (dart:async/stream_controller.dart:649:7)
E/flutter ( 9650): #16     _StreamController.add (dart:async/stream_controller.dart:595:5)
E/flutter ( 9650): #17     CombineLatestStream._buildController.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:rxdart/src/streams/combine_latest.dart:322:30)
E/flutter ( 9650): #18     _rootRunUnary (dart:async/zone.dart:1134:38)
E/flutter ( 9650): #19     _CustomZone.runUnary (dart:async/zone.dart:1031:19)
E/flutter ( 9650): #20     _CustomZone.runUnaryGuarded (dart:async/zone.dart:933:7)
E/flutter ( 9650): #21     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter ( 9650): #22     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:266:7)
E/flutter ( 9650): #23     _ForwardingStreamSubscription._add (dart:async/stream_pipe.dart:134:11)
E/flutter ( 9650): #24     _MapStream._handleData (dart:async/stream_pipe.dart:234:10)
E/flutter ( 9650): #25     _ForwardingStreamSubscription._handleData (dart:async/stream_pipe.dart:166:13)
E/flutter ( 9650): #26     _rootRunUnary (dart:async/zone.dart:1134:38)
E/flutter ( 9650): #27     _CustomZone.runUnary (dart:async/zone.dart:1031:19)
E/flutter ( 9650): #28     _CustomZone.runUnaryGuarded (dart:async/zone.dart:933:7)
E/flutter ( 9650): #29     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter ( 9650): #30     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:266:7)
E/flutter ( 9650): #31     _ForwardingStreamSubscription._add (dart:async/stream_pipe.dart:134:11)
E/flutter ( 9650): #32     _MapStream._handleData (dart:async/stream_pipe.dart:234:10)
E/flutter ( 9650): #33     _ForwardingStreamSubscription._handleData (dart:async/stream_pipe.dart:166:13)
E/flutter ( 9650): #34     _rootRunUnary (dart:async/zone.dart:1134:38)
E/flutter ( 9650): #35     _CustomZone.runUnary (dart:async/zone.dart:1031:19)
E/flutter ( 9650): #36     _CustomZone.runUnaryGuarded (dart:async/zone.dart:933:7)
E/flutter ( 9650): #37     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter ( 9650): #38     _DelayedData.perform (dart:async/stream_impl.dart:594:14)
E/flutter ( 9650): #39     _StreamImplEvents.handleNext (dart:async/stream_impl.dart:710:11)
E/flutter ( 9650): #40     _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:670:7)
E/flutter ( 9650): #41     _rootRun (dart:async/zone.dart:1122:38)
E/flutter ( 9650): #42     _CustomZone.run (dart:async/zone.dart:1023:19)
E/flutter ( 9650): #43     _CustomZone.runGuarded (dart:async/zone.dart:925:7)
E/flutter ( 9650): #44     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:965:23)
E/flutter ( 9650): #45     _rootRun (dart:async/zone.dart:1126:13)
E/flutter ( 9650): #46     _CustomZone.run (dart:async/zone.dart:1023:19)
E/flutter ( 9650): #47     _CustomZone.runGuarded (dart:async/zone.dart:925:7)
E/flutter ( 9650): #48     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:965:23)
E/flutter ( 9650): #49     _microtaskLoop (dart:async/schedule_microtask.dart:43:21)
E/flutter ( 9650): #50     _startMicrotaskLoop (dart:async/schedule_microtask.dart:52:5)