Palette GUI Crash

Mac os
The problem begins when pressing the key for the Palette GUI.
Crash Report
Whenever I try to open the Palette Gui it forces my game to crash.

Hi Mandos - can you confirm that you rebound your palette GUI key to J? Have you tried rebinding it back to C?

I did rebind it to J to start out with but turned it back to C when you said this is what you used. The problem still occurred.