block-editor
javascript
post-update
Editor Blank or Frozen After a Core or Plugin Update
The edit screen loads an empty white area or unresponsive controls after an update, with JavaScript errors in the console.
Read the fix block-editor rest-api wp-adminBlock Editor Cannot Save – ‘The Response Is Not a Valid JSON Response’
Saving or updating a post in the editor fails with 'Updating failed. The response is not a valid JSON response.'
Read the fix