Uncaught TypeError: Cannot read property ‘replace’ of undefined | WordPress | jQuery Error!

Uncaught TypeError: Cannot read property 'replace' of undefined
at jquery.js?ver=1.12.4:2
at PSEUDO (jquery.js?ver=1.12.4:2)
at wa (jquery.js?ver=1.12.4:2)
at fa.compile (jquery.js?ver=1.12.4:2)
at fa.select (jquery.js?ver=1.12.4:2)
at Function.fa (jquery.js?ver=1.12.4:2)
at Function.a.find (jquery-migrate.min.js?ver=1.4.1:2)
at n.fn.init.find (jquery.js?ver=1.12.4:2)
at n.fn.init.a.fn.find (jquery-migrate.min.js?ver=1.4.1:2)
at a.fn.init.n.fn.init (jquery.js?ver=1.12.4:2)

This may be caused by outdated theme or plugins!