Keep getting error Cannot install a MaterialPageRoute<dynamic> after disposing it

Question

After I click on the button once and go back and try clicking it again, I get his error. Please let me know what I'm doing wrong. Thanks!

import "package:flutter/material.dart";
import "historicalfigureinfo.dart";

void main() {
  runApp(const MaterialApp(home: Hwk3()));
}
class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return const MaterialApp();
  }
}
class Hwk3 extends StatefulWidget {
  const Hwk3({Key? key}) : super(key: key);

  @override
  _Hwk3State createState() => _Hwk3State();
}
class _Hwk3State extends State<Hwk3> {
  var nameArray = [
    'Abraham Lincoln',
    'Benito Juarez',
    'Claude Monet',
    'Charles Darwin',
    'Deng Xiaoping',
    'Frederick Chopin',
    'George Washington Carver',
    'Georgia O\'Keeffe',
    'Mahatma Gandhi',
    'Mark Twain',
    'Muhammad Jinnah',
    'Pablo Picasso',
    'Santos Dumont'
  ];
  List<Route> historicalfigures= [
    MaterialPageRoute(builder: (_) => AbrahamLincoln()),
    MaterialPageRoute(builder: (_) => BenitoJuarez()),
    MaterialPageRoute(builder: (_) => ClaudeMonet()),
    MaterialPageRoute(builder: (_) => CharlesDarwin()),
    MaterialPageRoute(builder: (_) => DengXiaoping()),
    MaterialPageRoute(builder: (_) => FredericChopin()),
    MaterialPageRoute(builder: (_) => GeorgeWashingtonCarver()),
    MaterialPageRoute(builder: (_) => GeorgiaOkeeffe()),
    MaterialPageRoute(builder: (_) => MahatmaGandhi()),
    MaterialPageRoute(builder: (_) => MarkTwain()),
    MaterialPageRoute(builder: (_) => MuhammadJinnah()),
    MaterialPageRoute(builder: (_) => PabloPicasso()),
    MaterialPageRoute(builder: (_) => SantosDumont()),
  ];

  @override
  Widget build(BuildContext context) {
    List<Route> myRoute = [];
    return Scaffold(
      appBar: AppBar(
        title: const Text('Historical Figures'),
      ),
      body: ListView.builder(
        itemCount: nameArray.length,
        itemBuilder: (BuildContext context, index) {
          return ListTile(
              title: Text(nameArray[index]),
            trailing: Icon(Icons.info_outlined),
            onTap: () {
              Navigator.of(context).push(historicalfigures[index]);
            },
          );
        },
      ),
    );
  }
}

This is the error I get. It seems like it disposes the button after I use it and doesn't reset it. The button is supposed to go to another page/different page depending on which button I press according to the historical name it's next to. Only works once though

Launching lib/main.dart on iPhone 13 in debug mode...
Running Xcode build...
Xcode build done.                                            6.6s
Debug service listening on ws://127.0.0.1:56466/gVaIxfjPH28=/ws
Syncing files to device iPhone 13...

======== Exception caught by gesture ===============================================================
The following assertion was thrown while handling a gesture:
Cannot install a MaterialPageRoute<dynamic> after disposing it.
'package:flutter/src/widgets/routes.dart':
Failed assertion: line 204 pos 12: '!_transitionCompleter.isCompleted'


Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
  https://github.com/flutter/flutter/issues/new?template=2_bug.md

When the exception was thrown, this was the stack: 
#2      TransitionRoute.install (package:flutter/src/widgets/routes.dart:204:12)
#3      ModalRoute.install (package:flutter/src/widgets/routes.dart:1125:11)
#4      _RouteEntry.handlePush (package:flutter/src/widgets/navigator.dart:3021:11)
#5      NavigatorState._flushHistoryUpdates (package:flutter/src/widgets/navigator.dart:3992:17)
#6      NavigatorState._pushEntry (package:flutter/src/widgets/navigator.dart:4604:5)
#7      NavigatorState.push (package:flutter/src/widgets/navigator.dart:4511:5)
#8      _Hwk3State.build.<anonymous closure>.<anonymous closure> (package:historical_figures/main.dart:66:37)
#9      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:989:21)
#10     GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:193:24)
#11     TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:608:11)
#12     BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
#13     BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:267:7)
#14     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:157:27)
#15     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:444:20)
#16     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:420:22)
#17     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:278:11)
#18     GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
#19     GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
#20     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
#21     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
#25     _invoke1 (dart:ui/hooks.dart:185:10)
#26     PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:293:7)
#27     _dispatchPointerDataPacket (dart:ui/hooks.dart:98:31)
(elided 5 frames from class _AssertionError and dart:async)
Handler: "onTap"