Cannot read properties of null (reading 'nodeType') on node.page.body

Thanks for raising and the fix @Gauravvvv. Yes, I am also able to reproduce this issue, however this JS error appears on every content type not specifically on "Basic page" only.

Put some comments in the MR.

Thank you.

Is this reproducible on a clean install?

@cilefen Yes, at-least I got this error on clean 11.x install.

Issue summary is incomplete

Will need steps to reproduce + tests.

Static patch file of MR up until #4 for use with composer-patches

I'm getting this error also when editing a node e.g. at /node/16/edit. The patch fixes it there as well.

Facing the same issue.
Patch #9 fixed the issue

Getting the same error in Drupal 10.2 - Seems to affect all admin pages

Patch #9 seems to have fixed it for my admin pages as well - 10.2.1 and 10.2.2

Returning to "needs work" as a test is required.

I can confirm the MR #6057 works.

I tested on Drupal 10.2.1

Re-rolled patch as its reproducible for 11.x branch and for the tests as the errors are more due to the JS mutation observer is missing a check and the error in the console cant be tracked in the Tests so can anyone suggest a way to have a test coverage here Else we can move this ticket forward.

Thanks!

I have tested the added changes and they work correctly! RTBC

I add the new changes in file.patch format

Marked 🐛 big_pipe JS checkMutation can throw type errors if parentNode is NULL Closed: duplicate as a duplicate. This still needs tests. Please keep work in the MR, patches are not required here.

I'm seeing this on Drupal 10.2.3 as well, issue 🐛 big_pipe sometimes fails to load blocks Active got included in 10.2.1 so I guess it makes sense.
The error is almost on all pages for me. It seems one of my browser extensions (Scraper 1.7, on brave, which I now disabled as I'm not using it) is causing DOM mutations on the body element, which triggers this.

big_pipe needs to be more resilient.
The MR fixes it. I wonder though if the NULL check should happen above, in checkMutationAndProcess?
I'll add a static diff patch of it (latest commit 6580c866), for composer, in case anyone else needs it.

This has been fixed in 🐛 big_pipe.js' checkMutation() does not check if node exists before using it Fixed