grunt dist

js/dist/modal.js

@@ -462,6 +462,9 @@ var Modal = (function ($) {
           }
 
           if (typeof config === 'string') {
+            if (data[config] === undefined) {
+              throw new Error('No method named "' + config + '"');
+            }
             data[config](relatedTarget);
           } else if (_config.show) {
             data.show(relatedTarget);