[wp-trac] [WordPress Trac] #56801: array_key_exists error in wp_apply_custom_classname_support

[WordPress Trac]

#56801: array_key_exists error in wp_apply_custom_classname_support
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 Reporter:  spacedmonkey  |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  6.1
Component:  Editor        |    Version:  trunk
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:                |
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 wp-includes/block-supports/custom-classname.php:48

 `array_key_exists() expects parameter 2 to be array, null given`

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Ticket URL: <https://core.trac.wordpress.org/ticket/56801>
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