Have been seeing this blank popup after latest upgrade when trying to edit any post

As admin when I try to edit any post, I see this blank pop. Clicking ok closes it and I can resume editing like normal. Nothing seems amiss, except this blank popup popping up!

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Are there any errors in the JavaScript console of your web browser?

It has stopped now. I did a ./launcher rebuild app today and after that it has not shown this popup. Will look at the console and log next time if it happens.