Open 1.1.0: World crash when hammering sandstone slab

[Mythos123]

Version:
1.1.0

What is the bug:
I have a setup with 2 autonomous activators, one placing sandstone slabs and the other with an RedstoneFlux Hammer to get Thaumcraft shards.
If the second activator with the hammer is faster then the first and tries to break only one slab (not double) the client immediatly closes in the momentt the slab would break.

Now i can`t enter my world because it constantly crashes as soon as the activator loads.

Mod & Version:
ExAstris

Paste.feed-the-beast.com log:
http://paste.feed-the-beast.com/view/36e8980b

Can it be repeated:
Should be possibly.

Known Fix:

 

[profrags]

Did you not have a backup?

 

[Mythos123]

Did you not have a backup?

i do and i switch to it now, lost 2hours but thats okay for me.

 

[Zacuis]

same with stone slabs. this bug was in ag skies to.