diff --git a/core/main/client/lib/webrtcadapter.js b/core/main/client/lib/webrtcadapter.js
index 80233a2c2..8232b8684 100644
--- a/core/main/client/lib/webrtcadapter.js
+++ b/core/main/client/lib/webrtcadapter.js
@@ -77,11 +77,16 @@ if (navigator.mozGetUserMedia) {
     return new mozRTCPeerConnection(pcConfig, pcConstraints);
   };
 
-  // The RTCSessionDescription object.
-  window.RTCSessionDescription = mozRTCSessionDescription;
+  try {
+    // The RTCSessionDescription object.
+    window.RTCSessionDescription = mozRTCSessionDescription;
 
-  // The RTCIceCandidate object.
-  window.RTCIceCandidate = mozRTCIceCandidate;
+    // The RTCIceCandidate object.
+    window.RTCIceCandidate = mozRTCIceCandidate;
+
+  }catch(err) {
+    
+  }
 
   // getUserMedia constraints shim.
   getUserMedia = (webrtcDetectedVersion < 38) ?