Guess my situation must be sort of uncommon because this issue should have affected everyone but I can't find it reported here.

I kept getting Uncaught TypeError: Cannot read property 'split' of undefined in

getHash: function($link) {
return $link.attr('href').split('#')[1];
},

until changed it to

getHash: function($link) {
return ($link.attr('href'))? $link.attr('href').split('#')[1] : '';
},

My copy of plugin is 2.2 but this function didn't change in the latest code so maybe the error persists.