@override
  Widget build(BuildContext context) {

    final PageController pageController = PageController(initialPage: currentIndex);
    final Widget pageView = PageView(
      controller: pageController,
      scrollDirection: Axis.horizontal,
      children: <Widget>[
        HomePage(user: widget.user),
        SettingsPage(user: widget.user)
      ],
    );

    return Scaffold(
      resizeToAvoidBottomPadding: false,
      resizeToAvoidBottomInset: false,
      body: pageView,
      bottomNavigationBar: bottomNavigationBar(context, currentIndex),
      floatingActionButton: currentIndex == 0 ? floatingActionButton(context, currentIndex, widget.user) : null,
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked
    );
  }

E/flutter (24809): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: NoSuchMethodError: The method 'codeUnitAt' was called on null.
E/flutter (24809): Receiver: null
E/flutter (24809): Tried calling: codeUnitAt(69)
E/flutter (24809): #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:50:5)
E/flutter (24809): #1      String.toUpperCase (dart:core-patch/string_patch.dart:1195:26)
E/flutter (24809): #2      TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1210:35)
E/flutter (24809): #3      FlutterError.dumpErrorToConsole (package:flutter/src/foundation/assertions.dart:621:11)
E/flutter (24809): #4      FlutterError.reportError (package:flutter/src/foundation/assertions.dart:710:14)
E/flutter (24809): #5      _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1034:20)
E/flutter (24809): #6      _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:974:9)
E/flutter (24809): #7      _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:784:7)
E/flutter (24809): #8      _rootRun (dart:async/zone.dart:1120:38)
E/flutter (24809): #9      _CustomZone.run (dart:async/zone.dart:1021:19)
E/flutter (24809): #10     _CustomZone.runGuarded (dart:async/zone.dart:923:7)
E/flutter (24809): #11     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
E/flutter (24809): #12     _rootRun (dart:async/zone.dart:1124:13)
E/flutter (24809): #13     _CustomZone.run (dart:async/zone.dart:1021:19)
E/flutter (24809): #14     _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:947:23)
E/flutter (24809): #15     Timer._createTimer.<anonymous closure> (dart:async-patch/timer_patch.dart:21:15)
E/flutter (24809): #16     _Timer._runTimers (dart:isolate-patch/timer_impl.dart:382:19)
E/flutter (24809): #17     _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:416:5)
E/flutter (24809): #18     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)
E/flutter (24809):