Segmentation fault

main.dart

import 'package:flutter/material.dart';
import 'package:luitsapp/Screens/splashScreen.dart';
import 'package:luitsapp/services/hive/credentialsManager.dart';
import 'package:tinycolor/tinycolor.dart';

void main() async {
  runApp(LUITSApp());
}

class LUITSApp extends StatefulWidget {
  static Function switchBrightness;
  @override
  _LUITSAppState createState() => _LUITSAppState();
}

class _LUITSAppState extends State<LUITSApp> {
  String appBrightness = AppBrightness.system;

  @override
  void initState() {
    super.initState();
    LUITSApp.switchBrightness = switchBrightness;
    WidgetsBinding.instance.addPostFrameCallback((timeStamp) async {
      this.appBrightness = await CredentialsManager().appBrightness();
      setState(() {});
    });
  }

  Future<void> switchBrightness() async {
    this.appBrightness = await CredentialsManager().appBrightness();
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      themeMode: appBrightness == AppBrightness.light
          ? ThemeMode.light
          : appBrightness == AppBrightness.dark
              ? ThemeMode.dark
              : ThemeMode.system,
      darkTheme: ThemeData(
          fontFamily: 'Calibri_Regular',
          brightness: Brightness.dark,
          primaryColor: TinyColor.fromString('#93bed1').darken(30).color,
          accentColor: TinyColor(Color(0xff1ab2fe)).darken(20).color,
          primarySwatch: Theme.of(context).primaryColor,
          accentIconTheme: IconThemeData().copyWith(color: Colors.white),
          primaryIconTheme: IconTheme.of(context).copyWith(color: Colors.white),
          primaryTextTheme:
              TextTheme().copyWith(headline6: TextStyle(color: Colors.white))),
      debugShowCheckedModeBanner: false,
      title: 'LUITS',
      theme: ThemeData(
          backgroundColor: Colors.white,
          fontFamily: 'Calibri_Regular',
          brightness: Brightness.light,
          primaryColor: TinyColor.fromString('#93bed1').darken().color,
          accentColor: TinyColor(Color(0xff1ab2fe)).darken().color,
          primarySwatch: Theme.of(context).primaryColor,
          primaryIconTheme: IconTheme.of(context).copyWith(color: Colors.black),
          primaryTextTheme:
              TextTheme().copyWith(headline6: TextStyle(color: Colors.black))),
      home: SplashScreen(),
    );
  }
}