[wp-trac] [WordPress Trac] #59915: Preview Whilst Editing Broken

[WordPress Trac]

#59915: Preview Whilst Editing Broken
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 Reporter:  simonjonharding  |      Owner:  (none)
     Type:  defect (bug)     |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  General          |    Version:  6.4
 Severity:  minor            |   Keywords:
  Focuses:                   |
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 When editing a page or post, trying to preview using the top right icon
 results in the URL
 wp-admin/undefined

 Previewing from the list of posts or pages works OK

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Ticket URL: <https://core.trac.wordpress.org/ticket/59915>
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