SafariPlugInUpdateNotifier Quit Unexpectedly

Go step by step and test.

1. Update Safari, if an update is available. Update may come with bug fixes.

    https://support.apple.com/en-us/HT204416

2. Quit Safari, launch Safari holding the Shift key down.

    https://support.apple.com/en-us/HT203987

3. Startup in Safe Mode. https://support.apple.com/guide/mac-help/start-up-your-mac-in-safe-mode-mh21245/mac.  

    Quote:

    It also does a basic check of your startup disk, similar to using First Aid in Disk Utility. 

    And it deletes some system caches, including font caches and 

    the kernel cache, which are automatically created again as needed.

4. Clear History

    https://support.apple.com/guide/safari/clear-your-browsing-history-sfri47acf5d6/mac

    Please read the article before clearing history, 

    this is like a low level resetting of Safari without affecting passwords and bookmarks.

5. If Safari doesn't open a webpage or isn’t working as expected

    https://support.apple.com/en-us/HT204098

About Safari Plug-ins: https://support.apple.com/en-us/HT203051

Here's the funny part... for me, this error pops up mostly when I'm not using Safari, or any other browser. In fact, it popped up this last time when the only thing running was App Store and I was updating the iWork apps. Also funny, it only happens on one of my 3 machines. All Catalina (current).

I'm experiencing the same situation on Catalina since Safari 14 was released, and I've been submitting all of the crash reports to Apple. It seems to only stop happening once I disable all Safari extensions. As soon as I re-enable any of the extensions, the multiple SafariPlugInUpdateNotifier Quit notifications happen again within a day (or until I reboot).

Annoying!

Fix this please.

Have you found a resolution or cause? I now have 3 different machines with this problem, and it's transitioning from the mildly annoying stage to the Completely Unacceptable phase.

All 3 machines are running Catalina, and are fully up to date.