Dragging multiple blocks inside columns block gives error

[finnruijter]

Hi there,

I've tested this on multiple sites that use core Gutenberg. When I create new 'Columns' block and try to drag multiple selected blocks in it, the whole Gutenberg editor gives me an error.

This is also the case in multiple WordPress sites. Everything is updated.

TypeError: Cannot read property 'firstChild' of null

at pp (​https://devqcare.wpengine.com/wp-includes/js/dist/block-editor.min.js?ver=390a9f83b606a55e8b523c4d16bdb08c:12:393446)
at ​https://devqcare.wpengine.com/wp-includes/js/dist/block-editor.min.js?ver=390a9f83b606a55e8b523c4d16bdb08c:12:394426
at Bh (​https://devqcare.wpengine.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:126:456)
at Dj (​https://devqcare.wpengine.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:162:476)
at unstable_runWithPriority (​https://devqcare.wpengine.com/wp-includes/js/dist/vendor/react.min.js?ver=16.13.1:25:260)
at Da (​https://devqcare.wpengine.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:60:280)
at xb (​https://devqcare.wpengine.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:162:231)
at Te (​https://devqcare.wpengine.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:146:79)
at ​https://devqcare.wpengine.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:61:68
at unstable_runWithPriority (​https://devqcare.wpengine.com/wp-includes/js/dist/vendor/react.min.js?ver=16.13.1:25:260)

[sabernhardt]

Welcome to Trac!

The Gutenberg repository has an open issue for this error already, and it will need to be fixed there.
​https://github.com/WordPress/gutenberg/issues/33610

If you would like to add to the discussion, please comment on that issue.