I keep crashing over and over

Describe your bug here.

I get this message when I try and enter the chart editor. I do have a few modifications that includes 2 custom note types, a few custom weeks, custom songs, and I replaced the files for the games main not textures in the files not using a note skin. I was going to show a friend my progress on my mod but then my game kept crashing. the message is in the command prompt section.

Command Prompt/Terminal logs (if existing)

flixel/graphics/frames/FlxAtlasFrames.hx (line 246)
StrumNote.hx (line 85)
StrumNote.hx (line 24)
StrumNote.hx (line 39)
editors/ChartingState.hx (line 308)
flixel/FlxGame.hx (line 637)
flixel/FlxGame.hx (line 724)
flixel/FlxGame.hx (line 677)
flixel/FlxGame.hx (line 545)
openfl/events/EventDispatcher.hx (line 402)
openfl/display/DisplayObject.hx (line 1399)

Uncaught Error: Null Object Reference
Please report this error to the GitHub page: https://github.com/ShadowMario/FNF-PsychEngine

> Crash Handler written by: sqirra-rng

Are you modding a build from source or with Lua?

Lua

What is your build target?

Windows

Did you edit anything in this build? If so, mention or summarize your changes.

2 custom note types, a few custom weeks, custom songs, and I replaced the files for the games main not textures in the files not using a note skin.

ShadowMario / FNF-PsychEngine