[wp-trac] [WordPress Trac] #54907: After upgrading to 5.9 I get blank screens when trying to edit or add posts

[WordPress Trac]

#54907: After upgrading to 5.9 I get blank screens when trying to edit or add posts
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 Reporter:  eTurboNews    |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Editor        |     Version:  5.9
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by ldigregorio):

 Just one other thing. The first page published without issue in firefox
 and now the second page won't save in either firefox or chrome. The error
 in both is "Publishing failed. The response is not a valid JSON response."

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Ticket URL: <https://core.trac.wordpress.org/ticket/54907#comment:10>
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