Null pointer

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5635 818b1a75-f10b-46b9-bf7c-635c3b92a50f

openair-cn/NAS/EURECOM-NAS/src/emm/sap/emm_as.c

@@ -2117,11 +2117,13 @@ static int _emm_as_establish_rej(const emm_as_establish_t *msg,
 #endif
         if (emm_ctx) {
             emm_security_context = emm_ctx->security;
+            if (emm_security_context) {
                 nas_msg.header.sequence_number = emm_security_context->dl_count.seq_num;
                 LOG_TRACE(DEBUG,
                         "Set nas_msg.header.sequence_number -> %u",
                         nas_msg.header.sequence_number);
             }
+        }
         /* Encode the initial NAS information message */
         int bytes = _emm_as_encode(
             &as_msg->nasMsg,