[wp-trac] [WordPress Trac] #55241: Disabling "settings.color.duotone" within theme.json causes fatal error undefined variable $filter

[WordPress Trac]

#55241: Disabling "settings.color.duotone" within theme.json causes fatal error
undefined variable $filter
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 Reporter:  aliakseyenkaihar  |       Owner:  audrasjb
     Type:  defect (bug)      |      Status:  accepted
 Priority:  normal            |   Milestone:  5.9.2
Component:  Themes            |     Version:  5.9.1
 Severity:  normal            |  Resolution:
 Keywords:  has-patch commit  |     Focuses:
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Comment (by audrasjb):

 Introduced in [52768].

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Ticket URL: <https://core.trac.wordpress.org/ticket/55241#comment:6>
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