In-place editor throws error and becomes non responsive sometimes when editing a section of a page

STEPS TO REPRODUCE

1. In a page, insert some text containing 2 or more headings, like:

   = Ne amores quidem sanctos a sapiente alienos esse arbitrantur. =
   
   Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quae enim adhuc protulisti, popularia sunt, ego autem a te elegantiora desidero. 
   
   == Non quam nostram quidem, inquit Pomponius iocans; ==
   
   [[Quid enim de amicitia statueris utilitatis causa expetenda vides.>>http://loripsum.net/]] Sed quanta sit alias, nunc tantum possitne esse tanta. Tum ille timide vel potius verecunde.
   

2. Try to edit a paragraph from the 'Pencil' button located on the right side of a heading

EXPECTED RESULTS

The page content enters in-place edit mode.

ACTUAL RESULTS

Sometimes (quite often on my tests) the in-place editing area becomes non responsive and an error is displayed in browser's console:

jquery.js:1468 Uncaught Error: Syntax error, unrecognized expression: #xwikicontent > #HNeamoresquidemsanctosasapientealienosessearbitrantur.
    at Function.fa.error (jquery.js:1468)
    at fa.tokenize (jquery.js:2125)
    at fa.select (jquery.js:2546)
    at Function.fa [as find] (jquery.js:869)
    at n.fn.init.find (jquery.js:2792)
    at new n.fn.init (jquery.js:2909)
    at n (jquery.js:75)
    at Object.afterEdit (InplaceEditing?language=en&docVersion=1.1:1)
    at i (jquery.js:3187)
    at Object.fireWith [as resolveWith] (jquery.js:3317)

At this point, the 'Save & View' or 'Cancel' buttons cannot be used to navigate away from the edit mode, the user has to click on another page.