[SoftPoly] Crash with TransferHeights

I apologize in advance that I don't have a more simplified mapset to give you.
I am not much of a mapper, myself.
Was playing the updated Paranoix (aka Paranoidiac) - https://github.com/drdteam/paranoidiac
Commit info:
After several swaps between softpoly and the normal software renderer, the crash occurred.
The crash occurred at:

Was playing the updated Paranoix (aka Paranoidiac) - https://github.com/drdteam/paranoidiac
Spoiler: debug screen
Commit info:
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P:\Paranoidiac>git describe --tags
alpha-530-g03097fe
B:\gzdoom\src>git describe --tags
g3.3pre-136-ga120a4657
B:\gzdoom\src>echo %DATE% %TIME%
2017-11-24 20:05:39.67
After several swaps between softpoly and the normal software renderer, the crash occurred.
The crash occurred at:
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] map P1M3
] warp 3065 -828