form validation error

[salim-lachdhaf]

in same cases the form validation ends with error:

E/flutter (24737): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: LateInitializationError: Field '_formState@234113790' has not been initialized.
E/flutter (24737): #0      FormController._formState (package:dynamic_form/src/controller/form_controller.dart)
E/flutter (24737): #1      FormController.validate (package:dynamic_form/src/controller/form_controller.dart:32:5)
E/flutter (24737): #2      FormConfigFtp.build.<anonymous closure> (package:mobil_dashboard/app/ui/component/form_config_ftp.dart:96:34)
E/flutter (24737): #3      FormConfigFtp.build.<anonymous closure> (package:mobil_dashboard/app/ui/component/form_config_ftp.dart:95:28)
E/flutter (24737): #4      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:989:21)
E/flutter (24737): #5      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:193:24)
E/flutter (24737): #6      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:608:11)
E/flutter (24737): #7      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
E/flutter (24737): #8      BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:267:7)
E/flutter (24737): #9      GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:157:27)
E/flutter (24737): #10     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:444:20)
E/flutter (24737): #11     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:420:22)
E/flutter (24737): #12     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:278:11)
E/flutter (24737): #13     GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
E/flutter (24737): #14     GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
E/flutter (24737): #15     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
E/flutter (24737): #16     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
E/flutter (24737): #17     _rootRunUnary (dart:async/zone.dart:1444:13)
E/flutter (24737): #18     _CustomZone.runUnary (dart:async/zone.dart:1335:19)
E/flutter (24737): #19     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
E/flutter (24737): #20     _invoke1 (dart:ui/hooks.dart:185:10)
E/flutter (24737): #21     PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:293:7)
E/flutter (24737): #22     _dispatchPointerDataPacket (dart:ui/hooks.dart:98:31)
E/flutter (24737):