Crash Reporter normally shows a dialog when an application has an unrecoverable error, on some systems it may be preferable to hide this dialog.
Start a new Terminal session (in Finder click Applications > Utilities > Terminal).
To set this to Disabled, type (or copy and paste) the following command:
defaults write com.apple.CrashReporter DialogType -string "none"
To reset this setting to the default value, type (or copy and paste) the following command:
defaults delete com.apple.CrashReporter DialogType
Close the Terminal session by typing
exit at the prompt.
Disclaimer: Making any changes to your system can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from these modifications can be resolved. Please follow the instructions carefully and use the information provided at your own risk.