diff --git a/app/ui.js b/app/ui.js
index 4c4e3ef1..c51a0e66 100644
--- a/app/ui.js
+++ b/app/ui.js
@@ -2175,6 +2175,11 @@ const UI = {
 
     toggleWebRTC() {
         if (UI.rfb) {
+            if (typeof RTCPeerConnection === 'undefined') {
+                UI.showStatus('This browser does not support WebRTC UDP Data Channels.', 'warn', 5000, true);
+                return;
+            }
+
             if (UI.getSetting('enable_webrtc')) {
                 UI.rfb.enableWebRTC = true;
             } else {
diff --git a/core/rfb.js b/core/rfb.js
index 58557019..4f17fcef 100644
--- a/core/rfb.js
+++ b/core/rfb.js
@@ -1074,7 +1074,7 @@ export default class RFB extends EventTargetMixin {
         this._resendClipboardNextUserDrivenEvent = true;
 
         // WebRTC UDP datachannel inits
-        {
+        if (typeof RTCPeerConnection !== 'undefined') {
             this._udpBuffer = new Map();
 
             this._udpPeer = new RTCPeerConnection({
@@ -1179,7 +1179,7 @@ export default class RFB extends EventTargetMixin {
             }
         }
 
-	    if (this._useUdp) {
+	    if (this._useUdp && typeof RTCPeerConnection !== 'undefined') {
             setTimeout(function() { this._sendUdpUpgrade() }.bind(this), 3000);
         }