[wp-trac] [WordPress Trac] #39407: Couldn't call method 'is_customize_preview()' in Widget.php

[WordPress Trac]

#39407: Couldn't call method 'is_customize_preview()' in Widget.php
--------------------------+-----------------------------
 Reporter:  n247s         |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Themes        |    Version:  3.8.1
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 After updating theme ''"twentyfourteen"'' to the newest version (Stable
 tag: 1.9) I got an ''"internal Server error (code=500)"'', not only when
 accesing the site itself, but also when trying to acces the admin-tool.

 I enable logging and found a single line printed in the logs:
 {{{
 [27-Dec-2016 15:31:05 UTC] PHP Fatal error:  Call to undefined function
 is_customize_preview() in /mnt/web016/d2/13/52084413/htdocs/WordPress_01
 /wp-content/themes/twentyfourteen/inc/widgets.php on line 40
 }}}
 I tried to manually update the Theme via FTP acces resulting in the same
 error.

 I hope this is enough information, if you need more feel free to ask.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39407>
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