diff --git a/dom/media/tests/crashtests/837421.html b/dom/media/tests/crashtests/837421.html
new file mode 100644
index 000000000000..e57450c85126
--- /dev/null
+++ b/dom/media/tests/crashtests/837421.html
@@ -0,0 +1,29 @@
+﻿﻿<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=837421
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Bug 837421</title>
+  <script type="application/javascript">
+    function start() {
+        var o0 = mozRTCPeerConnection();
+        var o1 = new mozRTCIceCandidate({"candidate":"127 15 UDP 1 stun.sipgate.net 134117531 type 2001:db8:85a3:0:0:8a2e:370:3478 rport","sdpMid":"application 3566220586 RTP/AVP 5000","sdpMLineIndex":-32767});
+        o0.connectDataConnection(3478,-1);
+        o0.connectDataConnection(-1,3478,2);
+        var o2 = mozRTCPeerConnection();
+        o2.addIceCandidate(o1);
+        o2.connectDataConnection(-1,3478,0.5);
+        o2.connectDataConnection(3478,-1,0.5);
+        var o3 = new mozRTCIceCandidate({"candidate":"31 2097151 IP 33554431 ::ffff:192.0.2.128 3999799469 type numb.viagenie.ca host","sdpMid":"application 1261077875 RTP/AVP 5000","sdpMLineIndex":16777215});
+        o2.connectDataConnection(1,3478);
+        o2.connectDataConnection(3478,1);
+        try {o2.updateIce()} catch(e) {}
+        o2.addIceCandidate(o3);
+    }
+  </script>
+</head>
+
+<body onload="start();"></body>
+</html>
diff --git a/dom/media/tests/crashtests/crashtests.list b/dom/media/tests/crashtests/crashtests.list
index 7bd5222728c8..e30a96d08cf0 100644
--- a/dom/media/tests/crashtests/crashtests.list
+++ b/dom/media/tests/crashtests/crashtests.list
@@ -8,5 +8,6 @@ load 799419.html
 load 801227.html
 load 802982.html
 load 812785.html
-load 834100.html
 load 822197.html
+load 834100.html
+load 837421.html
