fix

src/hooks/useWorldSim.ts

@@ -22,7 +22,7 @@ const useWorldSim = () => {
       // console.log('\x1b[34mmessage received:\x1b[0m', event.data);
       const { message, stressLevel }: IncomingMessage = JSON.parse(event.data);
       if (message) setMessages((prevMessages) => [...prevMessages, message]);
-      setStressLevel(stressLevel);
+      if (stressLevel) setStressLevel(stressLevel);
     });
 
     socket.current.addEventListener('close', (event) => {