[wp-trac] [WordPress Trac] #39391: fatal error Call to a member function add_filter() on array in /wp-includes/plugin.php on line 111

[WordPress Trac]

#39391: fatal error Call to a member function add_filter() on array in /wp-
includes/plugin.php on line 111
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 Reporter:  herko         |       Owner:
     Type:  defect (bug)  |      Status:  closed
 Priority:  normal        |   Milestone:
Component:  General       |     Version:  4.7
 Severity:  normal        |  Resolution:  duplicate
 Keywords:                |     Focuses:
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Changes (by dd32):

 * status:  new => closed
 * resolution:   => duplicate
 * milestone:  Awaiting Review =>


Comment:

 This is most likely caused by an out of date W3 Total cache plugin or
 old/unused Object Cache being installed on the site, That's mentioned in
 the [https://wordpress.org/support/topic/read-this-first-wordpress-4-7
 -master-list/ 4.7 master list of issues on the forums].
 You'll need to update any plugins to the latest version and ensure that
 any `wp-content/object-cache.php` files are either removed or updated to
 the latest version available

 We've fixed this in the current 4.7 branch and will be included in the
 4.7.1 release in January. See #39132 for where we've fixed this.
 If you'd like to test out the upcoming 4.7.1 release on your site before
 the release, it includes a fix for this and bunch of
 [https://core.trac.wordpress.org/query?status=closed&group=resolution&milestone=4.7.1
 other issues], see the directions
 [https://make.wordpress.org/core/handbook/testing/beta/  available here]
 for installing the beta testing plugin.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39391#comment:2>
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