diff --git a/mptcp/files/usr/share/omr/post-tracking.d/post-tracking b/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
index a72779a11..01ca2f79b 100755
--- a/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
+++ b/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
@@ -28,7 +28,7 @@ set_route() {
 set_ss_route() {
 	local server_ip
 	config_get server_ip $1 server
-	if [ "$(ip route show dev $OMR_TRACKER_DEVICE | grep $server_ip | grep $OMR_TRACKER_DEVICE_GATEWAY)" = "" ]; then
+	if [ "$server_ip" != "" ] && [ "$OMR_TRACKER_DEVICE_GATEWAY" != "" ] && [ "$(ip route show dev $OMR_TRACKER_DEVICE | grep $server_ip | grep $OMR_TRACKER_DEVICE_GATEWAY)" = "" ]; then
 		_log "Set server route via $OMR_TRACKER_DEVICE"
 		ip route replace $server_ip via $OMR_TRACKER_DEVICE_GATEWAY dev $OMR_TRACKER_DEVICE
 	fi
@@ -37,7 +37,7 @@ set_ss_route() {
 del_ss_route() {
 	local server_ip
 	config_get server_ip $1 server
-	if [ "$(ip route show dev $OMR_TRACKER_DEVICE | grep $server_ip | grep $OMR_TRACKER_DEVICE_GATEWAY)" != "" ]; then
+	if [ "$server_ip" != "" ] && [ "$OMR_TRACKER_DEVICE_GATEWAY" != "" ] &&  [ "$(ip route show dev $OMR_TRACKER_DEVICE | grep $server_ip | grep $OMR_TRACKER_DEVICE_GATEWAY)" != "" ]; then
 		_log "Remove server route via $OMR_TRACKER_DEVICE"
 		ip route delete $server_ip via $OMR_TRACKER_DEVICE_GATEWAY dev $OMR_TRACKER_DEVICE
 	fi