Hello!

I am currently encountering a problem where every single time I go to paint a texture on the terrain tool to the terrain, the whole workbench crashes. There is only 1 "default" texture already in use for the whole terrain and I can change this no problem by changing the fill surface layer but using the paint tool crashes the workbench as soon as I go to place a 2nd texture anywhere in any square.

Attached are the crash files for the above issue during a mod version of the issue.