GRAY ITS WORKING NOW

source/funkin/game/PlayState.hx

@@ -516,7 +516,7 @@ class PlayState extends MusicBeatState
 			FlxG.sound.music = inst;
 			FlxG.sound.music.play();
 		}
-		FlxG.sound.music.onComplete = endSong;
+		inst.onComplete = endSong;
 		vocals.play();
 
 		updateDiscordStatus();

source/funkin/system/Conductor.hx

@@ -105,11 +105,12 @@ class Conductor
 		var curBPM:Float = song.bpm;
 		var totalSteps:Int = 0;
 		var totalPos:Float = 0;
-		for (i in 0...song.notes.length)
+		for (i=>notes in song.notes)
 		{
-			if(song.notes[i].changeBPM && song.notes[i].bpm != curBPM)
+			if (notes == null) continue;
+			if (notes.changeBPM && notes.bpm != curBPM)
 			{
-				curBPM = song.notes[i].bpm;
+				curBPM = notes.bpm;
 				var event:BPMChangeEvent = {
 					stepTime: totalSteps,
 					songTime: totalPos,
@@ -118,7 +119,7 @@ class Conductor
 				bpmChangeMap.push(event);
 			}
 
-			var deltaSteps:Int = song.notes[i].lengthInSteps;
+			var deltaSteps:Int = notes.lengthInSteps;
 			totalSteps += deltaSteps;
 			totalPos += ((60 / curBPM) * 1000 / 4) * deltaSteps;
 		}