App crashes when clicking on link with special characters (iOS)

[wwdmbvbb]

Consider the following code

import 'package:flutter/material.dart';
import 'package:flutter_html_view/flutter_html_view.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {


  final String html1 = '<a href="https://de.wikipedia.org/wiki/Taubenschwänzchen">Taubenschwänzchen</a>';
  final String html2 = '<a href="https://de.wikipedia.org/wiki/Taubenschw%C3%A4nzchen">Taubenschwänzchen Replaced</a>';


  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(body: SafeArea(child: HtmlView(data: '$html1\n$html2'))
    ));
  }
}

Clicking on both links works fine in Android. Clicking on the first link causes a crash in iOS with the following exception:

2018-12-19 11:16:30.135686+0100 Runner[42605:280162] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'The specified URL has an unsupported scheme. Only HTTP and HTTPS URLs are supported.'
*** First throw call stack:
(
	0   CoreFoundation                      0x000000010340d1bb __exceptionPreprocess + 331
	1   libobjc.A.dylib                     0x00000001029ab735 objc_exception_throw + 48
	2   CoreFoundation                      0x000000010340d015 +[NSException raise:format:] + 197
	3   SafariServices                      0x00000001169e6356 -[SFSafariViewController initWithURL:configuration:] + 107
	4   SafariServices                      0x00000001169e6900 -[SFSafariViewController initWithURL:] + 94
	5   url_launcher                        0x0000000102350028 -[FLTUrlLauncherPlugin launchURLInVC:result:] + 152
	6   url_launcher                        0x000000010234f7f4 -[FLTUrlLauncherPlugin handleMethodCall:result:] + 996
	7   Flutter                             0x0000000100b5f9a2 __45-[FlutterMethodChannel setMethodCallHandler:]_block_invoke + 115
	8   Flutter                             0x0000000100b7c616 _ZNK5shell21PlatformMessageRouter21HandlePlatformMessageEN3fml6RefPtrIN5blink15PlatformMessageEEE + 166
	9   Flutter                             0x0000000100b7ffbe _ZN5shell15PlatformViewIOS21HandlePlatformMessageEN3fml6RefPtrIN5blink15PlatformMessageEEE + 38
	10  Flutter                             0x0000000100bd08e9 _ZNSt3__110__function6__funcIZN5shell5Shell29OnEngineHandlePlatformMessageEN3fml6RefPtrIN5blink15PlatformMessageEEEE4$_26NS_9allocatorIS9_EEFvvEEclEv + 57
	11  Flutter                             0x0000000100b8b4fa _ZN3fml15MessageLoopImpl15RunExpiredTasksEv + 922
	12  Flutter                             0x0000000100b8e832 _ZN3fml17MessageLoopDarwin11OnTimerFireEP16__CFRunLoopTimerPS0_ + 26
	13  CoreFoundation                      0x0000000103372f34 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
	14  CoreFoundation                      0x0000000103372b32 __CFRunLoopDoTimer + 1026
	15  CoreFoundation                      0x000000010337239a __CFRunLoopDoTimers + 266
	16  CoreFoundation                      0x000000010336ca1c __CFRunLoopRun + 2252
	17  CoreFoundation                      0x000000010336be11 CFRunLoopRunSpecific + 625
	18  GraphicsServices                    0x0000000107c0e1dd GSEventRunModal + 62
	19  UIKitCore                           0x000000010cefd81d UIApplicationMain + 140
	20  Runner                              0x000000010085f3d4 main + 68
	21  libdyld.dylib                       0x0000000106e7b575 start + 1
	22  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException