diff --git a/raspberry/roberto/views/frontend/templates/index.html b/raspberry/roberto/views/frontend/templates/index.html
index 73cc37c..ee1a97f 100644
--- a/raspberry/roberto/views/frontend/templates/index.html
+++ b/raspberry/roberto/views/frontend/templates/index.html
@@ -151,6 +151,12 @@
           return;
         }
         
+        if (msg.sid == null || msg.sid != socket.id) {
+          console.log("ignoring message for unknown sid");
+          console.log(socket.id);
+          return;
+        }
+
         if (!webrtcPeerConnection) {
           webrtcPeerConnection = new RTCPeerConnection(webrtcConfiguration);
           webrtcPeerConnection.ontrack = onAddRemoteStream;