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 227d5f982..86f186ee5 100755
--- a/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
+++ b/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
@@ -29,7 +29,7 @@ set_ss_route() {
 	local server_ip
 	config_get server_ip $1 server
 	if [ "$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"
+		_log "Set server $server_ip route via $OMR_TRACKER_DEVICE"
 		ip route replace $server_ip via $OMR_TRACKER_DEVICE_GATEWAY dev $OMR_TRACKER_DEVICE
 	fi
 }
@@ -38,7 +38,7 @@ del_ss_route() {
 	local server_ip
 	config_get server_ip $1 server
 	if [ "$server_ip" != "" ] &&  [ "$(ip route show dev $OMR_TRACKER_DEVICE | grep $server_ip)" != "" ]; then
-		_log "Remove server route via $OMR_TRACKER_DEVICE"
+		_log "Remove server $server_ip route via $OMR_TRACKER_DEVICE"
 		ip route delete $server_ip dev $OMR_TRACKER_DEVICE
 	fi
 }
@@ -47,26 +47,32 @@ sleep `expr $RANDOM % 10`
 
 # Get the current multipath status
 multipath_status="off"
-case "$(multipath "$OMR_TRACKER_DEVICE")" in
-	*default*)      multipath_status="on"       ;;
-	*backup*)       multipath_status="backup"   ;;
-	*handover*)     multipath_status="handover" ;;
-esac
+if [ -d "/sys/class/net/$OMR_TRACKER_DEVICE" ]; then
+	case "$(multipath "$OMR_TRACKER_DEVICE")" in
+		*default*)      multipath_status="on"       ;;
+		*backup*)       multipath_status="backup"   ;;
+		*handover*)     multipath_status="handover" ;;
+	esac
+fi
 
 default_gw=$(ip route show default | grep -v metric | awk '/default/ {print $3}')
 #current_interface_gw=$(uci -q get "network.$OMR_TRACKER_INTERFACE.gateway")
 
 # An interface in error will never be used in MPTCP
 if [ "$OMR_TRACKER_STATUS" = "ERROR" ]; then
-	#[ "$multipath_status" = "off" ] && exit 0
-	#_log "$OMR_TRACKER_DEVICE switched off"
-	multipath "$OMR_TRACKER_DEVICE" off
+	if [ -d "/sys/class/net/$OMR_TRACKER_DEVICE" ]; then
+		#[ "$multipath_status" = "off" ] && exit 0
+		#_log "$OMR_TRACKER_DEVICE switched off"
+		multipath "$OMR_TRACKER_DEVICE" off
+	fi
 	if [ "$default_gw" = "$OMR_TRACKER_DEVICE_GATEWAY" ] || [ "$default_gw" = "" ]; then
 		config_load network
 		config_foreach set_route interface $OMR_TRACKER_INTERFACE
 	fi
-	config_load shadowsocks-libev
-	config_foreach del_ss_route server
+	if [ -d "/sys/class/net/$OMR_TRACKER_DEVICE" ]; then
+		config_load shadowsocks-libev
+		config_foreach del_ss_route server
+	fi
 	exit 0
 fi