Fix test fail in es builds.

lodash.js

@@ -3688,6 +3688,9 @@
      * @returns {Object} Returns `object`.
      */
     function baseSet(object, path, value, customizer) {
+      if (!isObject(object)) {
+        return object;
+      }
       path = isKey(path, object) ? [path] : castPath(path);
 
       var index = -1,