[wp-trac] [WordPress Trac] #43005: JavaScript error Cannot read property 'action' of null on chrome (was: JavaScript error Cannot read property 'action' of null on chrome Version 63.0.3239.84)

[WordPress Trac]

#43005: JavaScript error Cannot read property 'action' of null on chrome
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 Reporter:  manikmist09     |       Owner:
     Type:  defect (bug)    |      Status:  new
 Priority:  normal          |   Milestone:  Awaiting Review
Component:  Administration  |     Version:  4.9.1
 Severity:  normal          |  Resolution:
 Keywords:  has-patch       |     Focuses:  javascript
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Comment (by manikmist09):

 @dingo_bastard , yes I do have Grammarly extension installed and disabling
 that the error does not shows. But if I check whether `message` itself is
 null or not before checking its property `message.action` the error does
 not show. so the condition will be like `null === message  || 'undefined'
 === typeof message.action`.

 I think that's good to have in that condition so we won't see any errors
 for the same reason. What do you think?

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Ticket URL: <https://core.trac.wordpress.org/ticket/43005#comment:4>
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