diff --git a/trunk/src/app/srs_app_rtc_server.cpp b/trunk/src/app/srs_app_rtc_server.cpp
index 7f5d59053..e61d44b02 100644
--- a/trunk/src/app/srs_app_rtc_server.cpp
+++ b/trunk/src/app/srs_app_rtc_server.cpp
@@ -331,6 +331,8 @@ srs_error_t SrsRtcServer::do_create_session(
 {
     srs_error_t err = srs_success;
 
+    SrsContextId cid = _srs_context->get_id();
+
     // first add publisher/player for negotiate sdp media info
     if (publish) {
         if ((err = session->add_publisher(req, remote_sdp, local_sdp)) != srs_success) {
@@ -390,7 +392,6 @@ srs_error_t SrsRtcServer::do_create_session(
     session->set_local_sdp(local_sdp);
     session->set_state(WAITING_STUN);
 
-    SrsContextId cid = _srs_context->get_id();
     // Before session initialize, we must setup the local SDP.
     if ((err = session->initialize(source, req, publish, username, cid)) != srs_success) {
         return srs_error_wrap(err, "init");
@@ -444,6 +445,8 @@ srs_error_t SrsRtcServer::setup_session2(SrsRtcConnection* session, SrsRequest*
 {
     srs_error_t err = srs_success;
 
+    SrsContextId cid = _srs_context->get_id();
+
     if (session->state() != WAITING_ANSWER) {
         return err;
     }
@@ -456,7 +459,6 @@ srs_error_t SrsRtcServer::setup_session2(SrsRtcConnection* session, SrsRequest*
     // TODO: FIXME: Collision detect.
     string username = session->get_local_sdp()->get_ice_ufrag() + ":" + remote_sdp.get_ice_ufrag();
 
-    SrsContextId cid = _srs_context->get_id();
     if ((err = session->initialize(source, req, false, username, cid)) != srs_success) {
         return srs_error_wrap(err, "init");
     }