fixed #85

src/utils.js

@@ -28,11 +28,11 @@ module.exports = {
             }
         }
         else {
-            while (current !== null && current !== this.element) {
+            while (current !== null && current !== element) {
                 actualLeft += current.offsetLeft;
                 current = current.offsetParent;
             }
         }
         return actualLeft - elementScrollLeft;
     },
-};
+};