diff --git a/app/react-components/ui.jsx b/app/react-components/ui.jsx
index a67956f..34be0d9 100644
--- a/app/react-components/ui.jsx
+++ b/app/react-components/ui.jsx
@@ -237,12 +237,15 @@ export default function Ui({disconnected}) {
     for (const id in payload) {
       const entity = ecs.get(id);
       const update = payload[id];
+      if (!update) {
+        continue;
+      }
       if (update.Sound?.play) {
         for (const sound of update.Sound.play) {
           (new Audio(sound)).play();
         }
       }
-      if (update?.MainEntity) {
+      if (update.MainEntity) {
         setMainEntity(localMainEntity = id);
       }
       if (localMainEntity === id) {
@@ -275,7 +278,7 @@ export default function Ui({disconnected}) {
     return () => {
       document.body.removeEventListener('contextmenu', onContextMenu);
     };
-  }, [])
+  }, []);
   return (
     <div
       className={styles.ui}