How to Make Crash Reporter Appear as a Notification in Mac OS

Oct 13, 2015 - 16 Comments

Crash Reporter as a notification in Mac OS X

Advanced Mac users who are either in development or another field which experiences frequent app crashing may find the persistent Crash Reporter windows with the ‘App quit unexpectedly’ message to be a nuisance, interfering with their workflow in Mac OS X. While one longstanding option is to disable the Crash Reporter dialog completely in MacOS X, perhaps a better approach is to send those crash reporting dialog boxes into notification center instead.

To be clear, this does not disable the Crash Reporter dialog windows, and it has no impact on crash logs themselves, it simply transforms the crash alert into a Notification within the Notification Center of Mac OS X. If you click on the crash report notification, the regular Mac crash report screen will open as usual.

Enable Crash Reporting as Notifications in Mac OS X

Open the Terminal and enter the following defaults write command string:

defaults write UseUNC 1

Hit return and that should be all there is to it, the next time an app crashes it will appear as a notification rather than a dialog window.

You can test it out yourself by intentionally crashing and beach balling an app or using force quit on a busy application in the ‘not responding’ state.

App crash reporter appearing as a notification in Mac OS X

Return Crash Report to the Default Dialog Window Option in Mac OS X

To disable the crash reporting as a notification feature and return to the default crash reporter dialog box, use the following defaults string instead:

defaults write UseUNC 0

Now if you crash an app it will open the typical alert dialog on the Mac.

App quit unexpectedly crash report dialog in Mac OS X

This should work with any modern version of Mac OS , a big thanks to Franz D. for sending in this tip!


Related articles:

Posted by: Paul Horowitz in Mac OS, Tips & Tricks


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  1. tester says:

    Doest work

  2. Luke says:

    Is there a similar option for the parental controls blocked website windows? That would be great:)

  3. RM says:

    I’d love to be able to remove the notification center completely.

  4. Dan Uff says:

    I think this is a very good tip – Thanks!

  5. devasia m says:

    When is apple going to fix the problem permanently?

  6. Sebby says:

    If you have access to the Apple Developer site and the Auxiliary Tools for Xcode package, you’ll find an app inside called “CrashReporter Prefs” which is a UI that allows you to set up CrashReporter in headless, full, or standard mode, with the choice to use Notification Centre as the output. You may also customise whether or not unhandled exception dialogs (which also occur occasionally) appear; these dialogs allow you to crash the app in the usual way or continue running in an inconsistent state.

    It’s a nice tip. I have been running CrashReporter in developer mode for a long while now, using NC for output. Processes die all the time in daily use (yay software quality!) and it’s nice to have substantial records of the fact.

  7. Wharf Xanadu says:

    Matt you have to crash the application. You can sometimes do that by force quitting an app mid of a process but best to just wait for one to crash.

  8. Matt Anderson says:

    I copied and pasted the command, then tried adding a sudo to it but if I force quit anything I do not get any notifications.

    • henkkaize says:

      Adding sudo does nothing here and force quiting applications doesn’t help either. Force quit does not make the app crash, it just quits. You’ll just need a real application crash for you to see this.

      • exacto mundo says:

        Exactly, the mention in the article is about using force quit on a ‘not responding’ app which will trigger the crash reporter, but force quitting by itself does not crash an app.

  9. resistor4u says:

    is `UseUNC` a new option? is it a dictionary type option? could someone explain the process of discovery for this?

    also, i suppose you could redirect all system and user app dialogues thru NC in this manner? if so, NC can be configured to be more like growl used to be?

  10. noah says:

    Neat! I’m not a particularly advanced user (nor am I computer illiterate — non-techy, reasonably skills in that context). Is there any reason I shouldn’t do this?

    • jonan says:

      This offers no benefit to users who do not regularly encounter the crash reporter dialog. This is for developers and advanced Mac users.

      • noah says:

        Sure it does. It doesn’t happen “regularly,” but it’s still annoying when it does. Anyway, my question wasn’t what benefit I get, it’s whether there’s a reason not to do it. Anon answered.

    • Anonymous says:

      No reason. The only reason it’s not a default is that I think Apple wants people to write crash reports. I never did anyway.

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