This is the file with the error on line 2, about 295 characters in:
The error is:
Uncaught Error: Syntax error, unrecognized expression: a[href=#scroll-top]
You can see it more clearly in this theme file on line 21:
It should be this:
Why this error now? WordPress 4.5 updated jQuery to version 1.12 which is better at detecting errors in code. Previous version ignored it / or guessed at the intent.
Hope that helps! Let me know.
More can be read about it here: