@@ -73,8 +73,8 @@ del_ovs_flows() {

     ovs-ofctl -O OpenFlow13 del-flows br0 "arp,nw_dst=${ipaddr}"

     ovs-ofctl -O OpenFlow13 del-flows br0 "arp,nw_src=${ipaddr}"

-    qos=$(ovs-vsctl get port ${veth_host} qos)

-    if [ "$qos" != "[]" ]; then

+    qos=$(ovs-vsctl get port ${veth_host} qos || true)

+    if [ -n "${qos}" -a "${qos}" != "[]" ]; then

         ovs-vsctl clear port ${veth_host} qos

         ovs-vsctl --if-exists destroy qos ${qos}

     fi