Exception: Sync test crash from example app

#0 _HomeScreenState.build.<anonymous closure> (package:traceway_example/main.dart:199:25) #1 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:345:24) #2 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:758:11) #3 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:383:5) #4 BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:353:7) #5 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:173:27) #6 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:532:20) #7 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:498:22) #8 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:473:11) #9 GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:437:7) #10 GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:394:5) #11 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:341:7) #12 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:308:9) #13 _invoke1 (dart:ui/hooks.dart:372:13) #14 PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:467:7) #15 _dispatchPointerDataPacket (dart:ui/hooks.dart:307:31)