diff --git a/debian/patches/series b/debian/patches/series
index 52c97d0f6..b04b136d4 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -80,6 +80,7 @@ upstream/tm-use-q-field-comparison-in-while-for-standard-t-co.patch
 # upstream master (5.5)
 upstream/ndb_redis-set-message-level-to-debug-on-reconnect.patch
 upstream/pv_headers-fix-removal-of-all-values-on-when-using-P.patch
+upstream/pv_headers-pvh_set_header-remove-values-to-set-null-.patch
 ### relevant for upstream
 #
 sipwise/pua_dialoginfo-refresh_pubruri_avps_flag.patch
diff --git a/debian/patches/upstream/pv_headers-pvh_set_header-remove-values-to-set-null-.patch b/debian/patches/upstream/pv_headers-pvh_set_header-remove-values-to-set-null-.patch
new file mode 100644
index 000000000..89404879a
--- /dev/null
+++ b/debian/patches/upstream/pv_headers-pvh_set_header-remove-values-to-set-null-.patch
@@ -0,0 +1,39 @@
+From: Victor Seva <vseva@sipwise.com>
+Date: Tue, 27 Jul 2021 13:13:36 +0200
+Subject: [PATCH] pv_headers: pvh_set_header, remove values to set null when
+ necessary
+
+* fix pvh_set_xavi for SR_XTYPE_NULL
+
+---
+ src/modules/pv_headers/pvh_xavp.c | 10 ++++++----
+ 1 file changed, 6 insertions(+), 4 deletions(-)
+
+diff --git a/src/modules/pv_headers/pvh_xavp.c b/src/modules/pv_headers/pvh_xavp.c
+index ae773e5..17cfdd1 100644
+--- a/src/modules/pv_headers/pvh_xavp.c
++++ b/src/modules/pv_headers/pvh_xavp.c
+@@ -374,7 +374,7 @@ int pvh_set_xavi(struct sip_msg *msg, str *xname, str *name, void *data,
+ 	LM_DBG("br_xname: %.*s name: %.*s append:%d\n",
+ 		br_xname.len, br_xname.s, name->len, name->s, append);
+ 	memset(&xval, 0, sizeof(sr_xval_t));
+-	if(data == NULL || SR_XTYPE_NULL) {
++	if(data == NULL || type == SR_XTYPE_NULL) {
+ 		xval.type = SR_XTYPE_NULL;
+ 	} else if(type == SR_XTYPE_STR) {
+ 		xval.type = SR_XTYPE_STR;
+@@ -630,9 +630,11 @@ int pvh_set_header(
+ 
+ 	if(val == NULL || (val->flags & PV_VAL_NULL)) {
+ 		if(idxf == PV_IDX_ALL) {
+-			cnt = xavi_rm_by_name(hname, 1, &avi);
+-			LM_DBG("removed %d values of %.*s=>%.*s, set $null\n",
+-				cnt, xavi->name.len, xavi->name.s, hname->len, hname->s);
++			if(hname_cnt > 1) {
++				cnt = xavi_rm_by_name(hname, 1, &avi);
++				LM_DBG("removed %d values of %.*s=>%.*s, set $null\n",
++					cnt, xavi->name.len, xavi->name.s, hname->len, hname->s);
++			}
+ 			if(pvh_set_xavi(msg, &xavi_name, hname, NULL, SR_XTYPE_NULL, 0, 0)
+ 					< 0)
+ 				goto err;