diff --git a/src/util.js b/src/util.js
index 7024b6b..e018c46 100644
--- a/src/util.js
+++ b/src/util.js
@@ -18,7 +18,7 @@ export const ensure = (value, msg) => {
 export const updateComponent = component => {
   // Check for document because of this bug:
   // https://github.com/facebook/react/issues/3620
-  if (component._rethinkMixinState.isMounted && typeof document !== 'undefined') {
+  if (component._rethinkMixinState && component._rethinkMixinState.isMounted && typeof document !== 'undefined') {
     component.forceUpdate();
   }
 };