--- a/netwerk/base/nsSocketTransportService2.cpp
+++ b/netwerk/base/nsSocketTransportService2.cpp
@@ -1460,18 +1460,22 @@ nsSocketTransportService::DiscoverMaxCou
 // Used to return connection info to Dashboard.cpp
 void
 nsSocketTransportService::AnalyzeConnection(nsTArray<SocketInfo> *data,
         struct SocketContext *context, bool aActive)
 {
     if (context->mHandler->mIsPrivate)
         return;
     PRFileDesc *aFD = context->mFD;
-    bool tcp = (PR_GetDescType(PR_GetIdentitiesLayer(aFD, PR_NSPR_IO_LAYER)) ==
-                PR_DESC_SOCKET_TCP);
+
+    PRFileDesc *idLayer = PR_GetIdentitiesLayer(aFD, PR_NSPR_IO_LAYER);
+
+    NS_ENSURE_TRUE_VOID(idLayer);
+
+    bool tcp = PR_GetDescType(idLayer) == PR_DESC_SOCKET_TCP;
 
     PRNetAddr peer_addr;
     PR_GetPeerName(aFD, &peer_addr);
 
     char host[64] = {0};
     PR_NetAddrToString(&peer_addr, host, sizeof(host));
 
     uint16_t port;