diff --git a/debian/patches/series b/debian/patches/series
index 9d3b1fa9a..406e9c941 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -1,5 +1,6 @@
 
 ## Package related
+sipwise/tt42709.patch
 debian/no_lib64_on_64_bits.patch
 debian/no_INSTALL_file.patch
 debian/fix_export.patch
diff --git a/debian/patches/sipwise/tt42709.patch b/debian/patches/sipwise/tt42709.patch
new file mode 100644
index 000000000..5ac67bba8
--- /dev/null
+++ b/debian/patches/sipwise/tt42709.patch
@@ -0,0 +1,10 @@
+--- a/src/modules/tm/t_reply.c
++++ b/src/modules/tm/t_reply.c
+@@ -299,6 +299,7 @@ inline static int update_totag_set(struc
+ 
+ 	for (i=t->fwded_totags; i; i=i->next) {
+ 		if (i->tag.len==tag->len
++                        && i->tag.s
+ 				&& memcmp(i->tag.s, tag->s, tag->len) ==0 ){
+ 			/* to tag already recorded */
+ 			LM_DBG("to-tag retransmission\n");