grunt dist

js/dist/dropdown.js

@@ -149,6 +149,9 @@ var Dropdown = (function ($) {
           }
 
           if (typeof config === 'string') {
+            if (data[config] === undefined) {
+              throw new Error('No method named "' + config + '"');
+            }
             data[config].call(this);
           }
         });