Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.30
Broken: version: 2.81 (sub 12), branch: master, commit date: 2019-09-18 21:04, hash: rB741d7d60ed90
Short description of error
I tried deactivating one modifier while keeping the other one active to see if Blender would crash, but this was not the case. Only when I used both simultaneously did the program reliably crash every time, regardless of brush.
Exact steps for others to reproduce the error
Add the modifiers that are active in the video and follow along.