I was flying around in my CTM map and I suddenly crashed. Has happened 3 times now.

Put the summary of the bug you're having here

What I expected to happen was...:
I'd be able to fly around as normal and keep on working

What actually happened was...:
I crashed, three times.
(Possibly specific to my map, didn't crash on others)

Steps to Reproduce:
1. Load map
2. Turn on smooth lighting
3. Fly around
Have tried on multiple render distances with smooth lighting on and off. EDIT: It appears to only happen with smooth lighting on.
EDIT 2: Ignore edit 1. Happens even with it off