diff --git a/app.js b/app.js
index 1ea5d15..7bf0803 100644
--- a/app.js
+++ b/app.js
@@ -109,7 +109,7 @@ const mediaCodecs = [
 
 const closeCall = (callId) => {
   try {
-    if (videoCalls[callId]) {
+    if (callId && videoCalls[callId]) {
       videoCalls[callId].producer?.close();
       videoCalls[callId].consumer?.close();
       videoCalls[callId]?.consumerTransport?.close();