* upd

Sortable.js

@@ -763,7 +763,7 @@
 					if (rootEl !== parentEl) {
 						newIndex = _index(dragEl);
 
-						if (newIndex != -1) {
+						if (newIndex >= 0) {
 							// drag from one list and drop into another
 							_dispatchEvent(null, parentEl, 'sort', dragEl, rootEl, oldIndex, newIndex);
 							_dispatchEvent(this, rootEl, 'sort', dragEl, rootEl, oldIndex, newIndex);
@@ -782,7 +782,8 @@
 						if (dragEl.nextSibling !== nextEl) {
 							// Get the index of the dragged element within its parent
 							newIndex = _index(dragEl);
-							if (newIndex != -1) {
+
+							if (newIndex >= 0) {
 								// drag & drop within the same list
 								_dispatchEvent(this, rootEl, 'update', dragEl, rootEl, oldIndex, newIndex);
 								_dispatchEvent(this, rootEl, 'sort', dragEl, rootEl, oldIndex, newIndex);
@@ -791,7 +792,10 @@
 					}
 
 					if (Sortable.active) {
-						// Drag end event
+						if (newIndex == null || newIndex === -1) {
+							newIndex = oldIndex;
+						}
+
 						_dispatchEvent(this, rootEl, 'end', dragEl, rootEl, oldIndex, newIndex);
 
 						// Save sorting
@@ -1154,20 +1158,22 @@
 
 	/**
 	 * Returns the index of an element within its parent
-	 * @param el
+	 * @param  {HTMLElement} el
-	 * @returns {number}
+	 * @return {number}
-	 * @private
 	 */
-	function _index(/**HTMLElement*/el) {
+	function _index(el) {
+		var index = 0;
+
 		if (!el || !el.parentNode) {
 			return -1;
 		}
-		var index = 0;
+
 		while (el && (el = el.previousElementSibling)) {
 			if (el.nodeName.toUpperCase() !== 'TEMPLATE') {
 				index++;
 			}
 		}
+
 		return index;
 	}