diff --git a/src/symbol.js b/src/symbol.js
index 26cdc4d..a1d316b 100644
--- a/src/symbol.js
+++ b/src/symbol.js
@@ -49,11 +49,13 @@ if (typeof FEATURE_NO_ES2015 === 'undefined') {
     },
     createWithSymbols = function (proto, descriptors) {
       var self = create(proto);
-      gOPN(descriptors).forEach(function (key) {
-        if (propertyIsEnumerable.call(descriptors, key)) {
-          $defineProperty(self, key, descriptors[key]);
-        }
-      });
+      if (descriptors !== null && typeof descriptors === 'object') {
+        gOPN(descriptors).forEach(function (key) {
+          if (propertyIsEnumerable.call(descriptors, key)) {
+            $defineProperty(self, key, descriptors[key]);
+          }
+        });
+      }
       return self;
     },
     copyAsNonEnumerable = function (descriptor) {