Edits are lost when opening description box

Hi,

Every time I edit the description box in a content type, the content I edit is lost. I show it here: https://www.loom.com/share/d7fa53a27dc648158dbb6252bd62f262 

These are the errors in the Google console before opening the box: https://i.imgur.com/DfL0py5.png 

And when I click on it: https://i.imgur.com/RLHVA7x.png

I attached a PHP error log.

Thanks in advance.

 

 

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