The following exception will be thrown in a range picker if no date range is selected when the submit button is pressed.

When the exception was thrown, this was the stack:
#0 _SfDateRangePickerState._handleOk (package:syncfusion_flutter_datepicker/src/date_picker/date_picker.dart:6955:27)
#1 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:989:21)
#2 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:193:24)
#3 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:608:11)
#4 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
#5 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:230:7)
#6 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:558:9)
#7 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:94:12)
#8 PointerRouter._dispatchEventToRoutes. (package:flutter/src/gestures/pointer_router.dart:139:9)
#9 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:400:8)
#10 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:137:18)
#11 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:123:7)
#12 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:440:19)
#13 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:420:22)
#14 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:278:11)
#15 GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
#16 GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
#17 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
#18 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
#22 _invoke1 (dart:ui/hooks.dart:185:10)
#23 PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:293:7)
#24 _dispatchPointerDataPacket (dart:ui/hooks.dart:98:31)
(elided 3 frames from dart:async)
Handler: "onTap"
Recognizer: TapGestureRecognizer#3bd9b
debugOwner: GestureDetector
state: possible
won arena
finalPosition: Offset(336.3, 445.7)
finalLocalPosition: Offset(40.2, 25.0)
button: 1
sent tap down
====================================================================================================

That might be caused by passing dynamic value which might be null as Object parameter.