Problem with (perhaps) Enfold theme: jQuery error in avia-footer-scripts

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I am a web developer but I have never used WordPress before. I have been asked to fix a site that recently started to misbehave.

I don’t know what an avia-footer-script is, and I can’t locate the JavaScript anywhere in WordPress itself. I imagined it would have something to do with a footer in the theme, but they seem like standard implementations with no customisation.

Any debugging tips? The fact is, wherever this script is coming from, it is not doing the error check to see if the object is undefined before invoking jQuery on it. Can anyone help?

Here is the site: [https://meditateinbrighton.com])

I should point out that it does work on some browsers, but not others. I did see something resembling a media query, but knowing that doesn’t really help. How do I identify and uproot the culprit?

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