[Bug 73620] New: VisualEditor: [Regression wmf9] "Uncaught TypeError: Cannot read property 'previousSibling' of undefined" appears when trying to open page settings dialog while the cursor is on a slug in the middle of two References lists

https://bugzilla.wikimedia.org/show_bug.cgi?id=73620

            Bug ID: 73620
           Summary: VisualEditor: [Regression wmf9] "Uncaught TypeError:
                    Cannot read property 'previousSibling' of undefined"
                    appears when trying to open page settings dialog while
                    the cursor is on a slug in the middle of two
                    References lists
           Product: VisualEditor
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Editing Tools
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected], [email protected],
                    [email protected], [email protected]
       Web browser: ---
   Mobile Platform: ---

Created attachment 17172
  --> https://bugzilla.wikimedia.org/attachment.cgi?id=17172&action=edit
Screenshot

Steps To reproduce:

1.Open a page with VE
2.Insert few references
3.Insert a reference list at the end of the page
4.Insert a group reference
5.Insert a group reference list at the end of the page
6.Place the cursor in the slug created between two references list
7.Now open Page Settings dialog 


Observed Result:
"Uncaught TypeError: Cannot read property 'previousSibling' of undefined"
appears in the console.

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