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js/dist/modal.js

@@ -138,7 +138,7 @@ var Modal = (function ($) {
         $(this._dialog).on(Event.MOUSEDOWN_DISMISS, function () {
           $(_this._element).one(Event.MOUSEUP_DISMISS, function (event) {
             if ($(event.target).is(_this._element)) {
-              that._ignoreBackdropClick = true;
+              _this._ignoreBackdropClick = true;
             }
           });
         });