I am sending non-null data to method. I shared my codes.
All parameter is non-null. I can see this by printing. But when i add the my object to Map, I am getting this Error:
E/flutter (13701): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: NoSuchMethodError: The method 'add' was called on null. E/flutter (13701): Receiver: null E/flutter (13701): Tried calling: add(Instance of 'WorkHourData') E/flutter (13701): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5) E/flutter (13701): #1 DataController.groupBy. (package:working_hours/controller/data_controller.dart:30:39) E/flutter (13701): #2 ListMixin.forEach (dart:collection/list.dart:86:13) E/flutter (13701): #3 DataController.groupBy (package:working_hours/controller/data_controller.dart:18:37) E/flutter (13701): #4 _DetailPagesState.bottomNavigationButtons... (package:working_hours/view/pages/detail_page.dart:80:41) E/flutter (13701): #5 State.setState (package:flutter/src/widgets/framework.dart:1267:30) E/flutter (13701): #6 _DetailPagesState.bottomNavigationButtons.. (package:working_hours/view/pages/detail_page.dart:77:23) E/flutter (13701): #7 _rootRunUnary (dart:async/zone.dart:1362:47) E/flutter (13701): #8 _CustomZone.runUnary (dart:async/zone.dart:1265:19) E/flutter (13701): #9 _FutureListener.handleValue (dart:async/future_impl.dart:152:18) E/flutter (13701): #10 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:704:45) E/flutter (13701): #11 Future._propagateToListeners (dart:async/future_impl.dart:733:32) E/flutter (13701): #12 Future._completeWithValue (dart:async/future_impl.dart:539:5) E/flutter (13701): #13 _completeOnAsyncReturn (dart:async-patch/async_patch.dart:254:13) E/flutter (13701): #14 DatabaseHelper.getWorkingHours (package:working_hours/controller/db_controller.dart) E/flutter (13701): E/flutter (13701):
Can you help me about this. **
