Fix bug in code to skip error items on Android.

android/src/main/java/com/ryanheise/just_audio/AudioPlayer.java

@@ -248,14 +248,12 @@ public class AudioPlayer implements MethodCallHandler, Player.EventListener, Met
 		}
 		sendError(String.valueOf(error.type), error.getMessage());
 		errorCount++;
-		if (player.hasNext()) {
-			if (errorCount <= 5) {
+		if (player.hasNext() && currentIndex != null && errorCount <= 5) {
 			int nextIndex = currentIndex + 1;
 			player.prepare(mediaSource);
 			player.seekTo(nextIndex, 0);
 		}
 	}
-	}
 
 	@Override
 	public void onSeekProcessed() {

example/lib/main.dart

@@ -71,7 +71,7 @@ class _MyAppState extends State<MyApp> {
       await _player.load(_playlist);
     } catch (e) {
       // catch load errors: 404, invalid url ...
-      print("An error occured (${e.code}): ${e.message}");
+      print("An error occured $e");
     }
   }
 

lib/just_audio.dart

@@ -598,6 +598,9 @@ class PlayerException {
   final String message;
 
   PlayerException(this.code, this.message);
+
+  @override
+  String toString() => "($code) $message";
 }
 
 /// An error that occurs when one operation on the player has been interrupted
@@ -606,6 +609,9 @@ class PlayerInterruptedException {
   final String message;
 
   PlayerInterruptedException(this.message);
+
+  @override
+  String toString() => "$message";
 }
 
 /// Encapsulates the playback state and current position of the player.