You now need to choose room width size before choosing room height size if you want it to work. The crash is fixed however if you pick room height in the very beginning it will just make the room width size to 1.
Prevented crash
Prevented a crash with room width and room height.
Mini canvas reworked
Mini canvas has been reworked to match the size of the main canvas, but the size is divided by 10.
Onionskin "fix" reverted
My bad. Totally forgot about line art.
Onionskin fix
Onionskin is working as intended now. It draws what you've drawn above and not below.