[wp-trac] [WordPress Trac] #43124: Cannot read property 'action' of null

[WordPress Trac]

#43124: Cannot read property 'action' of null
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 Reporter:  subratamal    |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  General       |     Version:  4.9.2
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:  javascript, administration
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Comment (by adamsilverstein):

 Hello @subratamal and welcome to WordPress Trac. Thanks for the bug
 report. This does not look like a core bug (I don't see a similar error in
 my install) and may be caused by code in your theme or plugins. Can you
 try disabling all plugins and switching to a default theme
 (twentyseventeen for example) and see if the problem persists?

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Ticket URL: <https://core.trac.wordpress.org/ticket/43124#comment:1>
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