Do note that turning off the Crash Reporter dialog window has no effect on crash reports, which are still visible in system logs and the Console app. It simply stops the window appearing in the Mac OS X GUI.
How to Disable Crash Reporter Dialog Box in Mac OS X
You can disable the Crash Reporter dialog box by launching the Terminal and entering the following command:
defaults write com.apple.CrashReporter DialogType none
and you can reverse this to show the Crash Reporter again by entering the following at the command line:
defaults write com.apple.CrashReporter DialogType crashreport
von http://osxdaily.com/2010/02/15/disable-the-crash-reporter-dialog-in-mac-os-x/