I have had a similar crash report in the snapshot 13w07a when I pressed a button that was on the side of an upwards dispenser with a 33:6 block (the full piston face block) adjacent.
I have had a similar crash report in the snapshot 13w07a when I pressed a button that was on the side of an upwards dispenser with a 33:6 block (the full piston face block) adjacent.