Freeplay crashes the game

[Numerator99]

When I try to pick freeplay, it shows me this error.
flixel/system/FlxSound.hx (line 312)
flixel/system/frontEnds/SoundFrontEnd.hx (line 368)
flixel/FlxGame.hx (line 743)
flixel/FlxGame.hx (line 677)
flixel/FlxGame.hx (line 551)
openfl/events/EventDispatcher.hx (line 402)
openfl/display/DisplayObject.hx (line 1399)

Uncaught Error: Null Object Reference

[gedehari]

I havent worked on this project for a long time.
I think this is because of multithreading issues, since I used threads to load the song to avoid stalling the main thread.
Not sure when I'll be working on this project though.