check if is undefined

src/core/instantiateReactComponent.js

@@ -40,7 +40,7 @@ assign(
 function isInternalComponentType(type) {
   return (
     typeof type === 'function' &&
-    typeof type.prototype === 'object' &&
+    typeof type.prototype !== 'undefined' &&
     typeof type.prototype.mountComponent === 'function' &&
     typeof type.prototype.receiveComponent === 'function'
   );