[Alpha 6 r151] Crash on placing wall adjacent to cliff

In the building editor whenever I try to place a wall column on the ground adjacent to the top side of a cliff, I have an application crash to Windows.

I have tried it twice. Both times I was using default wood column and I changed wall color to “wooden.”

EDIT: Okay, I found out to replicate it, you need to be in wall build mode (hold shift) not just placing a single column.

Workaround: Place a single column next to the cliffside, then place another while holding shift adjacent to the first.