diff --git a/talk/p2p/base/p2ptransportchannel_unittest.cc b/talk/p2p/base/p2ptransportchannel_unittest.cc
index 566fd14a2..c59a34237 100644
--- a/talk/p2p/base/p2ptransportchannel_unittest.cc
+++ b/talk/p2p/base/p2ptransportchannel_unittest.cc
@@ -1509,6 +1509,43 @@ TEST_F(P2PTransportChannelTest, TestIPv6Connections) {
   DestroyChannels();
 }
 
+// Simple test without any stun or turn server addresses. Making sure ports
+// can receive and send data.
+TEST_F(P2PTransportChannelTest, TestSharedSocketModeWithStunTurnAddress) {
+  AddAddress(0, kPublicAddrs[0]);
+  AddAddress(1, kPublicAddrs[1]);
+
+  const talk_base::SocketAddress null_addr;
+  GetEndpoint(0)->allocator_.reset(new cricket::BasicPortAllocator(
+        &(GetEndpoint(0)->network_manager_), null_addr, null_addr,
+        null_addr, null_addr));
+  GetEndpoint(1)->allocator_.reset(new cricket::BasicPortAllocator(
+        &(GetEndpoint(1)->network_manager_), null_addr, null_addr,
+        null_addr, null_addr));
+
+  SetAllocatorFlags(0, cricket::PORTALLOCATOR_ENABLE_SHARED_SOCKET |
+                       cricket::PORTALLOCATOR_ENABLE_SHARED_UFRAG);
+  SetAllocatorFlags(1, cricket::PORTALLOCATOR_ENABLE_SHARED_SOCKET |
+                       cricket::PORTALLOCATOR_ENABLE_SHARED_UFRAG);
+
+  SetAllocationStepDelay(0, kMinimumStepDelay);
+  SetAllocationStepDelay(1, kMinimumStepDelay);
+
+  CreateChannels(1);
+
+  EXPECT_TRUE_WAIT(ep1_ch1()->readable() &&
+                   ep1_ch1()->writable() &&
+                   ep2_ch1()->readable() &&
+                   ep2_ch1()->writable(),
+                   1000);
+
+  EXPECT_TRUE(ep1_ch1()->best_connection() &&
+              ep2_ch1()->best_connection());
+
+  TestSendRecv(1);
+  DestroyChannels();
+}
+
 // Test what happens when we have 2 users behind the same NAT. This can lead
 // to interesting behavior because the STUN server will only give out the
 // address of the outermost NAT.
diff --git a/talk/p2p/client/basicportallocator.cc b/talk/p2p/client/basicportallocator.cc
index 8338abed0..99d53f366 100644
--- a/talk/p2p/client/basicportallocator.cc
+++ b/talk/p2p/client/basicportallocator.cc
@@ -863,20 +863,19 @@ void AllocationSequence::CreateUDPPorts() {
   if (port) {
     // If shared socket is enabled, STUN candidate will be allocated by the
     // UDPPort.
-    if (IsFlagSet(PORTALLOCATOR_ENABLE_SHARED_SOCKET) &&
-        !IsFlagSet(PORTALLOCATOR_DISABLE_STUN)) {
-      ASSERT(config_ && !config_->stun_address.IsNil());
-      if (!(config_ && !config_->stun_address.IsNil())) {
-        LOG(LS_WARNING)
-            << "AllocationSequence: No STUN server configured, skipping.";
-        return;
-      }
+    if (IsFlagSet(PORTALLOCATOR_ENABLE_SHARED_SOCKET)) {
       udp_port_ = port;
-      // If there is a TURN UDP server available, then we will use TURN port
-      // to get stun address, otherwise by UDP port.
-      // Shared socket mode is not used in GTURN mode.
-      if (config_ && !config_->SupportsProtocol(RELAY_TURN, PROTO_UDP)) {
-        port->set_server_addr(config_->stun_address);
+
+      // If STUN is not disabled, setting stun server address to port.
+      if (!IsFlagSet(PORTALLOCATOR_DISABLE_STUN)) {
+        // If there is a TURN UDP server available, then we will use TURN port
+        // to get stun address, otherwise by UDP port.
+        // Shared socket mode is not used in GTURN mode.
+        if (config_ &&
+            !config_->SupportsProtocol(RELAY_TURN, PROTO_UDP) &&
+            !config_->stun_address.IsNil()) {
+          port->set_server_addr(config_->stun_address);
+        }
       }
     }
 
@@ -1059,7 +1058,9 @@ void AllocationSequence::OnReadPacket(
     port = udp_port_;
   }
   ASSERT(port != NULL);
-  port->HandleIncomingPacket(socket, data, size, remote_addr, packet_time);
+  if (port) {
+    port->HandleIncomingPacket(socket, data, size, remote_addr, packet_time);
+  }
 }
 
 void AllocationSequence::OnPortDestroyed(PortInterface* port) {