[wp-trac] [WordPress Trac] #57469: retrieve_widgets(): fatal error when a sidebar's widgets set to null (array is expected)

[WordPress Trac]

#57469: retrieve_widgets(): fatal error when a sidebar's widgets set to null (array
is expected)
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 Reporter:  kesselb       |       Owner:  (none)
     Type:  defect (bug)  |      Status:  closed
 Priority:  normal        |   Milestone:
Component:  Widgets       |     Version:  4.9
 Severity:  normal        |  Resolution:  invalid
 Keywords:  php80 close   |     Focuses:
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Comment (by hellofromTonya):

 #58351 reported the same issue but happened after switching themes:
 >In some subsites, that after switched themes I get the following PHP
 Fatal error.

 @lenasterg As noted in this ticket, the root cause seems to be a problem
 in the theme. Can you confirm if switching back to the original theme or
 to a different theme resolved the issue?

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Ticket URL: <https://core.trac.wordpress.org/ticket/57469#comment:8>
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