https://imgur.com/a/NZOwpuS
Happens when ever I try to select an item from the mod's list

Are you in multi-player by any chance? Or possibly a god/editor mode?

No, single player. I just noticed it only happens in my creative save (with https://mods.factorio.com/mod/creative-mod). It doesn't happen in my normal save. So probably something happening with the creative mod giving unlimited items or something. I have noticed it can be weird with the creative items it enables.

I think i have fixed it. I was able to get it to work in normal editor mode, but i didnt try with the creative mod. Give the latest update a try :)

Fixed! Although I came across another error. https://imgur.com/a/OEalZEa I can place creative items and put them back into the list in every spot except when the item is the last one in the list (the creative items happen to be at the end). This is probably caused by the creative mod making its items disappear once they leave my hand for some reason. So when I go to put the creative back into the list it also disappears at the same time.

I wasn't able to reproduce the crash, but I added in a bit of code that i think will stop the crash in general, let me know if the new update solves the issue :)

Fixed!