I got this error report on Safari http://d.pr/i/ZG6N
Sorry but I don't have more information. Is there a debug profiler like on chrome (ctrl+shift+j)? On chrome I can usually find the problem with it but I got no clue on what to do on safari...
EDIT: ok, found the developer console on safari, but that was no help. All I know is that on safari it says an object has no instances...