On Chrome, Firefox but not Microsoft Edge, when I inspect the console I see this message on Titlethis page and Titlethis page.

JQMIGRATE: Migrate is installed, version 1.4.1
(index):56 Uncaught ReferenceError: Ccomment is not defined
at (index):56
at mootools-core.js?1df54428651c6735e5ed478e16985d15:121
at Array.forEach (<anonymous>
at Function.forEach (mootools-core.js?1df54428651c6735e5ed478e16985d15:5)
at Array.each (mootools-core.js?1df54428651c6735e5ed478e16985d15:9)
at fireEvent (mootools-core.js?1df54428651c6735e5ed478e16985d15:120)
at HTMLDocument.j (mootools-core.js?1df54428651c6735e5ed478e16985d15:175)

I have been told that I should fix this.
Help needed, please, to understand what to do.