Fixed dispose issue when user disposes controller manually

example/lib/other_page/other_page.dart

@@ -0,0 +1,54 @@
+import 'package:better_player/better_player.dart';
+import 'package:flutter/material.dart';
+
+class OtherPage extends StatefulWidget {
+  @override
+  _OtherPageState createState() => _OtherPageState();
+}
+
+class _OtherPageState extends State<OtherPage> {
+  BetterPlayerController _betterPlayerController;
+
+  @override
+  void initState() {
+    var dataSource = BetterPlayerDataSource(
+      BetterPlayerDataSourceType.NETWORK,
+      "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ForBiggerBlazes.mp4",
+      subtitles: BetterPlayerSubtitlesSource(
+        type: BetterPlayerSubtitlesSourceType.NETWORK,
+        url:
+            "https://dl.dropboxusercontent.com/s/71nzjo2ux3evxqk/example_subtitles.srt",
+      ),
+    );
+
+    _betterPlayerController = BetterPlayerController(
+        BetterPlayerConfiguration(
+          controlsConfiguration:
+              BetterPlayerControlsConfiguration(enableProgressText: true),
+        ),
+        betterPlayerDataSource: dataSource);
+    _betterPlayerController.addEventsListener((event) {
+      print("Better player event: ${event.betterPlayerEventType}");
+    });
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+        appBar: AppBar(
+          title: Text("Other page"),
+        ),
+        body: AspectRatio(
+          aspectRatio: 16 / 9,
+          child: BetterPlayer(controller: _betterPlayerController),
+        ));
+  }
+
+  @override
+  void dispose() {
+    _betterPlayerController.dispose();
+    super.dispose();
+  }
+
+}