At my enderman farm, on a multiplayer server, there is a piston door; every time I open it, my minecraft crashes.
What I expected to happen was for the piston door to open, and I could move on with my day.
What actually happened was my minecraft crashed.
Steps to Reproduce:
1. Go to the end
2. Make a piston door with a button starting the pulse
3. If it doesn't work the first time, then try it again and your game will crash