WordPress 5.3 update causes media library file upload to break – Cannot convert undefined or null to object

Question

So after updating to WP 5.3 I can no longer use the file upload to choose files to add. I get the following error:

Uncaught TypeError: Cannot convert undefined or null to object
    at g.cleanup (backbone.min.js:1)

Error in console:
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How it shows when I try to choose an image:
enter image description here

I have the Classic Editor plugin installed so I can use it the classic way. I have disabled all other unnecessary plugins but the problem still persists. It’s only happened since the new WP core update to 5.3 yesterday.

Any ideas what’s going on here?

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, , user3574492 11 months 0 Answers 566 views 0

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