On loading a world containing item frames, my client crashed. This appears to only happen when you are near the item frames (I suspect they must be visible on screen but have not tested).
I removed the frames using `/kill @e[type=ItemFrame]`, which fixed the problem. I tried to place another item frame and the game once again crashed (last log file).
Duplicate of MC-54008 – If you have not, please use the search function in the future, to see if your bug has already been submitted.