diff --git a/.env b/.env
index 6d8b7b8..551a6ac 100644
--- a/.env
+++ b/.env
@@ -1,3 +1,3 @@
-PORT=3000
+PORT=3001
 IP=0.0.0.0 #	Listening IPv4 or IPv6.
 ANNOUNCED_IP=185.8.154.190 # Announced IPv4 or IPv6 (useful when running mediasoup behind NAT with private IP).
diff --git a/app.js b/app.js
index 3dbabbb..8ef4ba6 100644
--- a/app.js
+++ b/app.js
@@ -118,11 +118,13 @@ const mediaCodecs = [
   }
 
   setInterval(async () => {
-    const { callId, callback } = queue.shift();
-    if (router[callId] === undefined) {
-      router[callId] = await worker.createRouter({ mediaCodecs })
-      console.log(`[createRoom] Router ID: ${router[callId].id}`)
-      getRtpCapabilities(callId, callback)
+    if (queue.length > 0) {
+      const { callId, callback } = queue.shift();
+      if (router[callId] === undefined) {
+        router[callId] = await worker.createRouter({ mediaCodecs })
+        console.log(`[createRoom] Router ID: ${router[callId].id}`)
+        getRtpCapabilities(callId, callback)
+      }
     }
   }, 2000);