[wp-trac] [WordPress Trac] #40405: Customize: IE9 errors when attempting to generate changeset parameter

[WordPress Trac]

#40405: Customize: IE9 errors when attempting to generate changeset parameter
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 Reporter:  westonruter       |       Owner:
     Type:  defect (bug)      |      Status:  new
 Priority:  normal            |   Milestone:  4.7.4
Component:  Customize         |     Version:  4.7.3
 Severity:  normal            |  Resolution:
 Keywords:  has-patch commit  |     Focuses:
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Comment (by timmydcrawford):

 Steps to see the bug using IE9:

 - Open the customizer
 - Navigate to widgets and change the title of a widget
 - Click outside of the title and note the error will be shown in the
 console

 [[Image(https://cloud.githubusercontent.com/assets/22080/24881448/a39ae402-1df2-11e7
 -872d-8772464d527a.png)]]

 I tested out the same flow with this patch and all is working well.
 Thanks for the quick fix @westonruter !

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Ticket URL: <https://core.trac.wordpress.org/ticket/40405#comment:4>
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