[wp-trac] [WordPress Trac] #40954: Create Category within posts screen error

[WordPress Trac]

#40954: Create Category within posts screen error
-------------------------------+-----------------------------
 Reporter:  cfastenrath        |      Owner:
     Type:  defect (bug)       |     Status:  new
 Priority:  normal             |  Milestone:  Awaiting Review
Component:  Posts, Post Types  |    Version:  4.8
 Severity:  normal             |   Keywords:
  Focuses:  javascript         |
-------------------------------+-----------------------------
 When creating a new category within the "create posts" screen (post.php),
 there will be a javascript error. The new category will be created, but is
 only visible after refresh of the page.

 It is a completely fresh installation of wordpress. Updated to 4.8.
 Only default themes and plugins are activated.

 {{{
 Uncaught TypeError: Cannot read property '0' of undefined
     at Object.c [as addAfter] (load-scripts.php:115)
     at Object.j.is.d.element.wpAjax.validateForm.d.data.match.d.complete
 (load-scripts.php:10)
     at i (load-scripts.php:2)
     at Object.fireWith (load-scripts.php:2)
     at y (load-scripts.php:4)
     at XMLHttpRequest.c (load-scripts.php:4)
 }}}

 Response from admin-ajax call:

 {{{

 <?xml version='1.0' encoding='UTF-8' standalone='yes'?><wp_ajax><response
 action='add-category_9'><category id='9'
 position='-1'><response_data><![CDATA[<li id='category-9'><label
 class="selectit"><input value="9" type="checkbox" name="post_category[]"
 id="in-category-9" checked='checked' />
 again</label></li>]]></response_data><supplemental><newcat_parent><![CDATA[<select
 name='newcategory_parent' id='newcategory_parent' class='postform' >
         <option value='-1'>— Übergeordnete Kategorie
 —</option>
         <option class="level-0" value="9">again</option>
         <option class="level-0" value="1">Allgemein</option>
         <option class="level-0" value="8">Nochmal</option>
         <option class="level-0" value="7">Test</option>
 </select>
 ]]></newcat_parent></supplemental></category></response></wp_ajax>
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/40954>
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