"TypeError: Cannot read properties of undefined (reading 'map'). See dev console (F12) and/or server logs for more info."

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#1

I am getting the following error, what does it mean?

TypeError: Cannot read properties of undefined (reading ‘map’). See dev console (F12) and/or server logs for more info.

Michael

1 Like
Trying to use Stopwatch, getting "TypeError: t is null. "
#2

F12 opens the dev tools. A window with HTML and multiple windows should be what you see first. Find the Console button which is usually in the top bar.

Here you find errors. I’d suggest to go through them, search with Bing, Google and my favorite Qwant. Search operators help narrowing down search results.

Good luck

#3

I used to have the same issue as well. It seems to be caused by some undefinied labels based on your category rules.

You could try to add a Uncategorized category at the top level in your rules so that it can catch all the unmatched applications/titles.