Simulator closing unexpectedly

Hello frnds, in my app, i am using some sprites, and after the sprite animation deleting it properly by

sheet:dispose() instance:removeEventListener( "sprite", spriteListener ) instance = nil sprite = nil
yes some times the simulator is closing unexpectedly, and a popup comes it shows, “Corona Simulator quit unexpectedly. click Reopen to open the application again. This report will be sent to Apple automatically”
and here is the terminal log, i think it may help you to understand the problem exactly.

ALmixer_FreeData: alDeleteBuffers failed. Invalid Operation
/Applications/CoronaSDK/Corona Terminal: line 9: 362 Bus error: 10 “$path/Corona Simulator.app/Contents/MacOS/Corona Simulator” $*
logout

[Process completed]

can anybody please help and suggest me what should i do to avoid this problem. [import]uid: 163563 topic_id: 31098 reply_id: 331098[/import]