iphone ios application home button press/applicationDidEnterBackground crash

hallo, i am newbie in developing iphne/ios application and i have encountered some problem

generrraly my app (which is iphone camera image processing app) has no visible errors at today stage except the one

when i press the home button to send my app off screen (putting to the background), and then press the app icon to 'wake it up' again it crashes

what would it be...? what the reason of it would be? what is done to my app (seen from the view of programmer - i mean开发者_运维问答 internal game state) by this home buton operation? - what i should take care of before "applicationDidEnterBackground" eventually?

thanx for answer

Is this happening when you are running it from Xcode? Xcode does not like it if you hit the home button and start it again from within the device/simulator. Is it crashing if you launch it from the device (or simulator) without Xcode running? If not, then there probably isn't a problem.