'SQLite DataBase (data persistence)

I Input some data but the program still reload

enter image description here

Performing hot reload...
Syncing files to device Android SDK built for x86...
Reloaded 1 of 624 libraries in 863ms.
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
I/TextInputPlugin( 8477): Composing region changed by the framework. Restarting the input method.
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
I/TextInputPlugin( 8477): Composing region changed by the framework. Restarting the input method.
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
I/TextInputPlugin( 8477): Composing region changed by the framework. Restarting the input method.
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
E/flutter ( 8477): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type 'Null' is not a subtype of type 'int'
E/flutter ( 8477): #0      new Course (package:data_persistence_flutter/model/course.dart:8:9)
E/flutter ( 8477): #1      _NewCourseState.build.<anonymous closure> (package:data_persistence_flutter/pages/newcourse.dart:67:32)
E/flutter ( 8477): #2      _NewCourseState.build.<anonymous closure> (package:data_persistence_flutter/pages/newcourse.dart:66:28)
E/flutter ( 8477): #3      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:989:21)
E/flutter ( 8477): #4      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:198:24)
E/flutter ( 8477): #5      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:608:11)
E/flutter ( 8477): #6      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
E/flutter ( 8477): #7      BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:230:7)
E/flutter ( 8477): #8      PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:563:9)
E/flutter ( 8477): #9      PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:94:12)
E/flutter ( 8477): #10     PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:139:9)
E/flutter ( 8477): #11     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:539:8)
E/flutter ( 8477): #12     PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:137:18)
E/flutter ( 8477): #13     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:123:7)
E/flutter ( 8477): #14     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:439:19)
E/flutter ( 8477): #15     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:419:22)
E/flutter ( 8477): #16     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:322:11)
E/flutter ( 8477): #17     GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
E/flutter ( 8477): #18     GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
E/flutter ( 8477): #19     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
E/flutter ( 8477): #20     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
E/flutter ( 8477): #21     _rootRunUnary (dart:async/zone.dart:1444:13)
E/flutter ( 8477): #22     _CustomZone.runUnary (dart:async/zone.dart:1335:19)
E/flutter ( 8477): #23     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
E/flutter ( 8477): #24     _invoke1 (dart:ui/hooks.dart:169:10)
E/flutter ( 8477): #25     PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:293:7)
E/flutter ( 8477): #26     _dispatchPointerDataPacket (dart:ui/hooks.dart:88:31)
E/flutter ( 8477): 
W/IInputConnectionWrapper( 8477): getSelectedText on inactive InputConnection
W/IInputConnectionWrapper( 8477): requestCursorAnchorInfo on inactive InputConnection
W/IInputConnectionWrapper( 8477): getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper( 8477): getTextBeforeCursor on inactive InputConnection
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
I/TextInputPlugin( 8477): Composing region changed by the framework. Restarting the input method.
W/IInputConnectionWrapper( 8477): getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper( 8477): getTextBeforeCursor on inactive InputConnection
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
I/TextInputPlugin( 8477): Composing region changed by the framework. Restarting the input method.
W/IInputConnectionWrapper( 8477): getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper( 8477): getTextBeforeCursor on inactive InputConnection
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
E/flutter ( 8477): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type 'Null' is not a subtype of type 'int'
E/flutter ( 8477): #0      new Course (package:data_persistence_flutter/model/course.dart:8:9)
E/flutter ( 8477): #1      _NewCourseState.build.<anonymous closure> (package:data_persistence_flutter/pages/newcourse.dart:67:32)
E/flutter ( 8477): #2      _NewCourseState.build.<anonymous closure> (package:data_persistence_flutter/pages/newcourse.dart:66:28)
E/flutter ( 8477): #3      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:989:21)
E/flutter ( 8477): #4      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:198:24)
E/flutter ( 8477): #5      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:608:11)
E/flutter ( 8477): #6      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
E/flutter ( 8477): #7      BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:230:7)
E/flutter ( 8477): #8      PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:563:9)
E/flutter ( 8477): #9      PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:94:12)
E/flutter ( 8477): #10     PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:139:9)
E/flutter ( 8477): #11     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:539:8)
E/flutter ( 8477): #12     PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:137:18)
E/flutter ( 8477): #13     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:123:7)
E/flutter ( 8477): #14     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:439:19)
E/flutter ( 8477): #15     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:419:22)
E/flutter ( 8477): #16     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:322:11)
E/flutter ( 8477): #17     GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
E/flutter ( 8477): #18     GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
E/flutter ( 8477): #19     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
E/flutter ( 8477): #20     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
E/flutter ( 8477): #21     _rootRunUnary (dart:async/zone.dart:1444:13)
E/flutter ( 8477): #22     _CustomZone.runUnary (dart:async/zone.dart:1335:19)
E/flutter ( 8477): #23     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
E/flutter ( 8477): #24     _invoke1 (dart:ui/hooks.dart:169:10)
E/flutter ( 8477): #25     PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:293:7)
E/flutter ( 8477): #26     _dispatchPointerDataPacket (dart:ui/hooks.dart:88:31)
E/flutter ( 8477): 
W/IInputConnectionWrapper( 8477): getSelectedText on inactive InputConnection
W/IInputConnectionWrapper( 8477): requestCursorAnchorInfo on inactive InputConnection
W/IInputConnectionWrapper( 8477): getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper( 8477): getTextBeforeCursor on inactive InputConnection
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
I/TextInputPlugin( 8477): Composing region changed by the framework. Restarting the input method.
W/IInputConnectionWrapper( 8477): getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper( 8477): getTextBeforeCursor on inactive InputConnection
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
I/TextInputPlugin( 8477): Composing region changed by the framework. Restarting the input method.
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
I/TextInputPlugin( 8477): Composing region changed by the framework. Restarting the input method.
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
I/TextInputPlugin( 8477): Composing region changed by the framework. Restarting the input method.
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
D/InputConnectionAdaptor( 8477): The input method toggled cursor monitoring on
E/flutter ( 8477): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type 'Null' is not a subtype of type 'int'
E/flutter ( 8477): #0      new Course (package:data_persistence_flutter/model/course.dart:8:9)
E/flutter ( 8477): #1      _NewCourseState.build.<anonymous closure> (package:data_persistence_flutter/pages/newcourse.dart:67:32)
E/flutter ( 8477): #2      _NewCourseState.build.<anonymous closure> (package:data_persistence_flutter/pages/newcourse.dart:66:28)
E/flutter ( 8477): #3      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:989:21)
E/flutter ( 8477): #4      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:198:24)
E/flutter ( 8477): #5      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:608:11)
E/flutter ( 8477): #6      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
E/flutter ( 8477): #7      BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:230:7)
E/flutter ( 8477): #8      PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:563:9)
E/flutter ( 8477): #9      PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:94:12)
E/flutter ( 8477): #10     PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:139:9)
E/flutter ( 8477): #11     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:539:8)
E/flutter ( 8477): #12     PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:137:18)
E/flutter ( 8477): #13     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:123:7)
E/flutter ( 8477): #14     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:439:19)
E/flutter ( 8477): #15     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:419:22)
E/flutter ( 8477): #16     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:322:11)
E/flutter ( 8477): #17     GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
E/flutter ( 8477): #18     GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
E/flutter ( 8477): #19     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
E/flutter ( 8477): #20     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
E/flutter ( 8477): #21     _rootRunUnary (dart:async/zone.dart:1444:13)
E/flutter ( 8477): #22     _CustomZone.runUnary (dart:async/zone.dart:1335:19)
E/flutter ( 8477): #23     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
E/flutter ( 8477): #24     _invoke1 (dart:ui/hooks.dart:169:10)
E/flutter ( 8477): #25     PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:293:7)
E/flutter ( 8477): #26     _dispatchPointerDataPacket (dart:ui/hooks.dart:88:31)
E/flutter ( 8477):
flutterandroid-studiodart


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