Poking around with Google developer tools while my asp.net project was running on Chrome, it flags "jquery-migrate-1.2.0.min.js" on the Resources tab, Scripts section, with: "Uncaught TypeError: Cannot read property '1' of null"
Is this something I should worry about? If so, how to resolve the problem -- revert to an older version of migrate, or...???
UPDATE
Now it's gone, although the only thing I did different was swap out the minified version of jquery 1.9.1 for the "debug" version.