[wp-trac] [WordPress Trac] #43858: Website-Icon with filename "favicon.ico.png" causes problems

[WordPress Trac]

#43858: Website-Icon with filename "favicon.ico.png" causes problems
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 Reporter:  info@…        |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  4.9.5
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Hello,

 I added an Website Icon with the name "favicon.ico.png" via Customizer.
 After that I got PHP errors and wasn't able to log in to my site any
 longer (field user name is empty). I swtched wp debug on and got this
 error:
 preg_replace(): Compilation failed: missing terminating ] for character
 class at offset 30 in formatting.php on line 4669

 After I removed all database entries with favicon.ico.png in it, all was
 fine again...

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Ticket URL: <https://core.trac.wordpress.org/ticket/43858>
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