diff --git a/background/index.js b/background/index.js
index a54bdb5..df6ad7b 100644
--- a/background/index.js
+++ b/background/index.js
@@ -52,7 +52,7 @@ const fetchNewData = () => {
   });
 
   fetchSpaceApi().then((json) => {
-    if (window.spaceApi.state.open !== json.state.open) {
+    if (window.spaceApi && window.spaceApi.state.open !== json.state.open) {
       sendNotification(json.state.open)
     }
     window.spaceApi = json;