[wp-trac] [WordPress Trac] #52757: 5.7 issue: Updating failed. The response is not a valid JSON response.

[WordPress Trac]

#52757: 5.7 issue: Updating failed. The response is not a valid JSON response.
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 Reporter:  ludvickk      |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Editor        |     Version:  5.7
 Severity:  critical      |  Resolution:
 Keywords:                |     Focuses:
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Comment (by ludvickk):

 Downgrade to 5.6.2 fixed this problem. But when I installed 5.7 problem is
 back.

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Ticket URL: <https://core.trac.wordpress.org/ticket/52757#comment:1>
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