I have a mobile site built with JQuery mobile (and of course JQuery).
I am seeing this error for Opera Mini users (various versions)
Uncaught exception: ReferenceError: Undefined variable: filters
Looking at the JQuery source I see 'filters' is referenced many times, and it is not in use with my own code, so can only assume there is some issue with Opera Mini.
I have tried it out myself with these versions (basically all current as of today):
JQuery 1.11.1 JQuery Mobile 1.4.5 Opera Mini/15.0.2125
Not seeing this error with any other browsers.
I posted this on StackOverflow - click here - have not got any answers, but two other have the same issue and both say it started on 31 March, but I have seen it since the 23rd