Crash when blowing extended pistons up with TNT

when I try to blow extended pistons up, minecraft crashes

what I expected to happen was...
I expected that pistons break

What actually happened...
pistons didn't break and minecraft crashed

Steps to Reproduce:
1. place down a piston
2. power the piston with redstone signal
3. place TNT block next to the piston
4. power the TNT with redstone signal
5. Don't move!
6. game crashes!