Possible fix

public/script.js

@@ -115,7 +115,8 @@ document
     .querySelector("#close")
     .addEventListener("click", () => popup.classList.add("dismissed"))
 
-navigator.mediaDevices
+myPeer.on("open", (id) =>
+    navigator.mediaDevices
         .getUserMedia({
             video: true,
             audio: true,
@@ -135,9 +136,9 @@ navigator.mediaDevices
             socket.on("user-connected", (userId) =>
                 connectToNewUser(userId, stream)
             )
-
-        myPeer.on("open", (id) => socket.emit("join-room", ROOM_ID, id))
+            socket.emit("join-room", ROOM_ID, id)
         })
+)
 
 socket.on("user-disconnected", (userId) => {
     const call = myPeer.connections[userId]