diff --git a/libs/sofia-sip/.update b/libs/sofia-sip/.update
index 93e9497fa0..31b25be307 100644
--- a/libs/sofia-sip/.update
+++ b/libs/sofia-sip/.update
@@ -1 +1 @@
-Fri Jan 17 15:37:19 UTC 2020
+Wed Feb 12 22:23:00 UTC 2020
diff --git a/libs/sofia-sip/libsofia-sip-ua/sdp/sdp.c b/libs/sofia-sip/libsofia-sip-ua/sdp/sdp.c
index 8088181bf8..0e248c69df 100644
--- a/libs/sofia-sip/libsofia-sip-ua/sdp/sdp.c
+++ b/libs/sofia-sip/libsofia-sip-ua/sdp/sdp.c
@@ -1189,8 +1189,8 @@ int sdp_session_cmp(sdp_session_t const *a, sdp_session_t const *b)
 
   for (ab = a->sdp_bandwidths, bb = b->sdp_bandwidths;
        ab || bb;
-       ab = ab->b_next, bb = bb->b_next)
-    if ((rv = sdp_bandwidth_cmp(a->sdp_bandwidths, b->sdp_bandwidths)))
+       ab = (ab ? ab->b_next : NULL), bb = (bb ? bb->b_next : NULL))
+    if ((rv = sdp_bandwidth_cmp(ab, bb)))
       return rv;
 
   if ((rv = sdp_time_cmp(a->sdp_time, b->sdp_time)))
@@ -1199,14 +1199,14 @@ int sdp_session_cmp(sdp_session_t const *a, sdp_session_t const *b)
     return rv;
 
   for (aa = a->sdp_attributes, ba = b->sdp_attributes;
-       aa || bb;
-       aa = aa->a_next, ba = ba->a_next)
+       aa || ba;
+       aa = (aa ? aa->a_next : NULL), ba = (ba ? ba->a_next : NULL))
     if ((rv = sdp_attribute_cmp(aa, ba)))
       return rv;
 
   for (am = a->sdp_media, bm = b->sdp_media;
        am || bm;
-       am = am->m_next, bm = bm->m_next)
+       am = (am ? am->m_next : NULL), bm = (bm ? bm->m_next : NULL))
     if ((rv = sdp_media_cmp(am, bm)))
       return rv;
 
@@ -1268,6 +1268,9 @@ int sdp_bandwidth_cmp(sdp_bandwidth_t const *a, sdp_bandwidth_t const *b)
   if ((a != NULL) != (b != NULL))
     return (a != NULL) < (b != NULL) ? -1 : 1;
 
+  if (!a || !b)
+    return -1;
+
   if (a->b_modifier != b->b_modifier)
     return a->b_modifier < b->b_modifier ? -1 : 1;
   if (a->b_modifier == sdp_bw_x &&
@@ -1310,6 +1313,9 @@ int sdp_repeat_cmp(sdp_repeat_t const *a, sdp_repeat_t const *b)
   if ((a != NULL) != (b != NULL))
     return (a != NULL) < (b != NULL) ? -1 : 1;
 
+  if (!a || !b)
+    return -1;
+
   if (a->r_interval != b->r_interval)
     return a->r_interval < b->r_interval ? -1 : 1;
   if (a->r_duration != b->r_duration)
@@ -1397,6 +1403,9 @@ int sdp_rtpmap_cmp(sdp_rtpmap_t const *a, sdp_rtpmap_t const *b)
   if ((a != NULL) != (b != NULL))
     return (a != NULL) < (b != NULL) ? -1 : 1;
 
+  if (!a || !b)
+    return -1;
+
   if (a->rm_pt != b->rm_pt)
     return a->rm_pt < b->rm_pt ? -1 : 1;
 
@@ -1456,6 +1465,9 @@ int sdp_media_cmp(sdp_media_t const *a, sdp_media_t const *b)
   if ((rv = (a != NULL) - (b != NULL)))
     return rv;
 
+  if (!a || !b)
+    return -1;
+
   if (a->m_type != b->m_type)
     return a->m_type < b->m_type ? -1 : 1;
   if (a->m_type == sdp_media_x)
@@ -1482,7 +1494,7 @@ int sdp_media_cmp(sdp_media_t const *a, sdp_media_t const *b)
 
   for (arm = a->m_rtpmaps, brm = b->m_rtpmaps;
        arm || brm;
-       arm = arm->rm_next, brm = brm->rm_next)
+       arm = (arm ? arm->rm_next : NULL), brm = (brm ? brm->rm_next : NULL))
     if ((rv = sdp_rtpmap_cmp(arm, brm)))
       return rv;
 
@@ -1494,13 +1506,13 @@ int sdp_media_cmp(sdp_media_t const *a, sdp_media_t const *b)
 
   for (ac = a->m_connections, bc = b->m_connections;
        ac || bc;
-       ac = ac->c_next, bc = bc->c_next)
+       ac = (ac ? ac->c_next : NULL), bc = (bc ? bc->c_next : NULL))
   if ((rv = sdp_connection_cmp(ac, bc)))
     return rv;
 
   for (ab = a->m_bandwidths, bb = b->m_bandwidths;
        ab || bb;
-       ab = ab->b_next, bb = bb->b_next)
+       ab = (ab ? ab->b_next : NULL), bb = (bb ? bb->b_next : NULL))
     if ((rv = sdp_bandwidth_cmp(ab, bb)))
       return rv;
 
@@ -1509,7 +1521,7 @@ int sdp_media_cmp(sdp_media_t const *a, sdp_media_t const *b)
 
   for (aa = a->m_attributes, ba = b->m_attributes;
        aa || ba;
-       aa = aa->a_next, ba = ba->a_next)
+       aa = (aa ? aa->a_next : NULL), ba = (ba ? ba->a_next : NULL))
     if ((rv = sdp_attribute_cmp(aa, ba)))
       return rv;
 
diff --git a/libs/sofia-sip/libsofia-sip-ua/sdp/torture_sdp.c b/libs/sofia-sip/libsofia-sip-ua/sdp/torture_sdp.c
index fcd25d645d..f29ac7f762 100644
--- a/libs/sofia-sip/libsofia-sip-ua/sdp/torture_sdp.c
+++ b/libs/sofia-sip/libsofia-sip-ua/sdp/torture_sdp.c
@@ -225,6 +225,83 @@ static int test_session(void)
   END();
 }
 
+
+static char const s0_cmp_msg[] =
+"v=0\n"
+"s=/sdp_torture\n"
+"o=sdp_torture 0 0 IN IP4 0.0.0.0\n"
+"b=AS:64\n"
+"b=CRASH:32\n"
+"m=audio 0 RTP/AVP 96 97 98 10 99 8 0\n"
+"a=rtpmap:96 X-AMR-WB/16000\n"
+"a=rtpmap:97 X-AMR/8000\n"
+"a=rtpmap:98 GSM-EFR/8000\n"
+"a=rtpmap:10 L16/16000\n"
+"a=rtpmap:99 G723/8000\n"
+"a=rtpmap:8 PCMA/8000\n"
+"a=rtpmap:0 PCMU/8000\n"
+"m=video 0 *\n"
+"m=* 0 RTP/AVP *\n"
+;
+
+static char const s1_cmp_msg[] =
+"v=0\n"
+"s=/sdp_torture\n"
+"o=sdp_torture 0 0 IN IP4 0.0.0.0\n"
+"b=AS:64\n"
+"m=audio 0 RTP/AVP 96 97 98 10 99 8 0\n"
+"a=rtpmap:96 X-AMR-WB/16000\n"
+"a=rtpmap:97 X-AMR/8000\n"
+"a=rtpmap:98 GSM-EFR/8000\n"
+"a=rtpmap:10 L16/16000\n"
+"a=rtpmap:99 G723/8000\n"
+"a=rtpmap:8 PCMA/8000\n"
+"a=rtpmap:0 PCMU/8000\n"
+"m=video 0 *\n"
+"m=* 0 RTP/AVP *\n"
+;
+
+static int test_sdp_session_cmp(void)
+{
+	su_home_t *home = su_home_create(), *home2 = su_home_create();
+	sdp_session_t *sdp_src, *sdp_target;
+	sdp_session_t const *sdp = NULL;
+	sdp_parser_t *parser, *parser2;
+
+	BEGIN();
+
+	su_home_check(home);
+	TEST_1(home);
+
+	su_home_check(home2);
+	TEST_1(home2);
+
+	TEST_1((parser = sdp_parse(home, s0_cmp_msg, sizeof(s0_cmp_msg), sdp_f_config)));
+	TEST_1((sdp_src = sdp_session(parser)));
+
+	TEST_1((parser2 = sdp_parse(home2, s1_cmp_msg, sizeof(s1_cmp_msg), sdp_f_config)));
+	TEST_1((sdp_target = sdp_session(parser2)));
+
+	/* Check comparing */
+	TEST(sdp_session_cmp(sdp_src, sdp_target), 1);
+
+	/* frees all data created by the parser including 'sdp_src' */
+	sdp_parser_free(parser);
+	
+	/* destroy the first home instance */
+	su_home_check(home);
+	su_home_unref(home);
+
+	/* frees all data created by the parser including 'sdp_target' */
+	sdp_parser_free(parser2);
+
+	/* destroy the second home object */
+	su_home_check(home2);
+	su_home_unref(home2);
+
+	END();
+}
+
 static char const s1_msg[] =
   "v=0\r\n"
   "o=- 2435697 2435697 IN IP4 172.21.137.44\r\n"
@@ -925,6 +1002,7 @@ int main(int argc, char *argv[])
   null = fopen("/dev/null", "ab");
 
   retval |= test_error(); fflush(stdout);
+  retval |= test_sdp_session_cmp(); fflush(stdout);
   retval |= test_session(); fflush(stdout);
   retval |= test_session2(); fflush(stdout);
   retval |= test_pint(); fflush(stdout);