diff --git a/libs/sofia-sip/libsofia-sip-ua/nta/nta.c b/libs/sofia-sip/libsofia-sip-ua/nta/nta.c
index 9af20568e3..b0cb19f4c3 100644
--- a/libs/sofia-sip/libsofia-sip-ua/nta/nta.c
+++ b/libs/sofia-sip/libsofia-sip-ua/nta/nta.c
@@ -3920,6 +3920,18 @@ char const *nta_leg_get_rtag(nta_leg_t const *leg)
     return NULL;
 }
 
+/** Get local request sequence number. */
+uint32_t nta_leg_get_seq(nta_leg_t const *leg)
+{
+  return leg ? leg->leg_seq : 0;
+}
+
+/** Get remote request sequence number. */
+uint32_t nta_leg_get_rseq(nta_leg_t const *leg)
+{
+  return leg ? leg->leg_rseq : 0;
+}
+
 /** Save target and route set at UAC side.
  *
  * @sa nta_leg_server_route(), @RFC3261 section 12.1.2
diff --git a/libs/sofia-sip/libsofia-sip-ua/nta/sofia-sip/nta.h b/libs/sofia-sip/libsofia-sip-ua/nta/sofia-sip/nta.h
index 2d34688774..f7385759f2 100644
--- a/libs/sofia-sip/libsofia-sip-ua/nta/sofia-sip/nta.h
+++ b/libs/sofia-sip/libsofia-sip-ua/nta/sofia-sip/nta.h
@@ -210,6 +210,12 @@ SOFIAPUBFUN char const *nta_leg_rtag(nta_leg_t *leg, char const *tag);
 /** Get remote tag. */
 SOFIAPUBFUN char const *nta_leg_get_rtag(nta_leg_t const *leg);
 
+/** Get local request sequence number. @NEW_1_12_9 */
+SOFIAPUBFUN uint32_t nta_leg_get_seq(nta_leg_t const *leg);
+
+/** Get remote request sequence number. @NEW_1_12_9 */
+SOFIAPUBFUN uint32_t nta_leg_get_rseq(nta_leg_t const *leg);
+
 /** Set UAC route. */
 SOFIAPUBFUN int nta_leg_client_route(nta_leg_t *leg, 
 				     sip_record_route_t const *route, 
diff --git a/libs/sofia-sip/libsofia-sip-ua/su/su_alloc.c b/libs/sofia-sip/libsofia-sip-ua/su/su_alloc.c
index d150f563e3..cbca943bb7 100644
--- a/libs/sofia-sip/libsofia-sip-ua/su/su_alloc.c
+++ b/libs/sofia-sip/libsofia-sip-ua/su/su_alloc.c
@@ -780,7 +780,9 @@ void *su_alloc(su_home_t *home, isize_t size)
  */
 void su_free(su_home_t *home, void *data)
 {
-  if (data) {
+  if (!data)
+    return;
+
   if (home) {
     su_alloc_t *allocation;
     su_block_t *sub = MEMLOCK(home);
diff --git a/libs/sofia-sip/libsofia-sip-ua/su/su_root.c b/libs/sofia-sip/libsofia-sip-ua/su/su_root.c
index 42fd813428..b17ef400e0 100644
--- a/libs/sofia-sip/libsofia-sip-ua/su/su_root.c
+++ b/libs/sofia-sip/libsofia-sip-ua/su/su_root.c
@@ -1046,10 +1046,13 @@ void su_msg_save(su_msg_r save, su_msg_r rmsg)
  */
 void su_msg_destroy(su_msg_r rmsg)
 {
-  su_msg_t *msg = rmsg[0];
+  su_msg_t *msg;
+
   assert(rmsg);
   rmsg[0] = NULL;
 
+  msg = rmsg[0], rmsg[0] = NULL;
+
   if (msg) {
     SU_TASK_ZAP(msg->sum_to, su_msg_destroy);
     SU_TASK_ZAP(msg->sum_from, su_msg_destroy);