diff --git a/mock.js b/mock.js
index ce12c7e2d28f..67c818204719 100644
--- a/mock.js
+++ b/mock.js
@@ -23,7 +23,7 @@ const getValue = node => {
   if (typeof node === "number") {
     return node;
   }
-  return node[" __value"];
+  return node && node[" __value"];
 };
 
 class AnimatedValue {