git apply sites/all/modules/xc/xc_util/patches/xc-autocomplete.patch
patch -p1 < sites/all/modules/xc/xc_util/patches/xc-autocomplete.patch
The patch will change the misc/autocomplete.js file a little bit. The most important change is that instead of the original
}).size() == 0;
you will see
}); // }).size() == 0;
around line 29.