From 7bc5fd5024323588bf280f6cda4327237babea2c Mon Sep 17 00:00:00 2001
From: Nicole Levy <n.levy@raceroster.com>
Date: Tue, 3 Apr 2018 22:14:12 -0400
Subject: [PATCH] throw error if passed undefined

---
 packages/react/src/ReactElement.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/react/src/ReactElement.js b/packages/react/src/ReactElement.js
index 0594412fa78f9..3d804fc54a587 100644
--- a/packages/react/src/ReactElement.js
+++ b/packages/react/src/ReactElement.js
@@ -290,6 +290,10 @@ export function cloneAndReplaceKey(oldElement, newKey) {
  * See https://reactjs.org/docs/react-api.html#cloneelement
  */
 export function cloneElement(element, config, children) {
+  if (element === undefined) {
+    throw new Error("Cannot call 'cloneElement' on undefined.");
+  }
+
   let propName;
 
   // Original props are copied