Date Picker Dialog can not popup on iOS

[zxconan]

iOS 12

Debug output:
[VERBOSE-2:ui_dart_state.cc(148)] Unhandled Exception: 'package:flutter/src/material/date_picker.dart': Failed assertion: line 1167 pos 10: '!initialDate.isAfter(lastDate)': initialDate must be on or before lastDate #0 _AssertionError._doThrowNew (dart:core/runtime/liberrors_patch.dart:40:39) #1 _AssertionError._throwNew (dart:core/runtime/liberrors_patch.dart:36:5) #2 showDatePicker package:flutter/…/material/date_picker.dart:1167 <asynchronous suspension> #3 DialogsExample.buildMyRouteContent.<anonymous closure> package:flutter_catalog/routes/nav_dialogs_ex.dart:119 #4 _InkResponseState._handleTap package:flutter/…/material/ink_well.dart:513 #5 _InkResponseState.build.<anonymous closure> package:flutter/…/material/ink_well.dart:568 #6 GestureRecognizer.invokeCallback package:flutter/…/gestures/recognizer.dart:120 #7 TapGestureRecognizer._checkUp package:flutter/…/gestures/tap.dart:242 #8 TapGestureRecognizer.acceptGesture package:flutter/…/gestures/tap.dart:204 #9 GestureArenaManager.sweep package:flutter/…/gestures/arena.dart:156 #10 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent package:flutter/…/gestures/binding.dart:218 #11 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent package:flutter/…/gestures/binding.dart:192 #12 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent package:flutter/…/gestures/binding.dart:149 #13 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue package:flutter/…/gestures/binding.dart:101 #14 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket package:flutter/…/gestures/binding.dart:85 #15 _rootRunUnary (dart:async/zone.dart:1136:13) #16 _CustomZone.runUnary (dart:async/zone.dart:1029:19) #17 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7) #18 _invoke1 (dart:ui/hooks.dart:223:10)