This page is not Valid XHTML 1.0 Transitional!

Whilst trying to validate my blog (https://www.dicontas.co.uk/blog/), the XHTML validator is coming back saying it has failed with a few errors. The code is part of wordpress code so I dont know (or want to) mess about with it without good advice from an expert.

The errors are:

a) Error Line 44 column 116: general entity “f” not defined and no default entity.

…hp?r=’ + escape(window.location) + ‘&f=’ + escape(document.referrer);

This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.

b) Line 44 column 117: reference not terminated by REFC delimiter.

…p?r=’ + escape(window.location) + ‘&f=’ + escape(document.referrer);

If you meant to include an entity that starts with “&”, then you should terminate it with “;”. Another reason for this error message is that you inadvertently created an entity by failing to escape an “&” character just before this text.

There are other warnings shown, see https://validator.w3.org/check?uri=http%3A%2F%2Fwww.dicontas.co.uk%2Fblog%2F&charset=%28detect+automatically%29&doctype=Inline for more info.

Can anyone assist???

Many thanks in advance.
Stewart