--- elwix/config/etc/default/rc.d/019.dwds_relay_rstchan.stop	2011/07/05 23:43:00	1.1
+++ elwix/config/etc/default/rc.d/019.dwds_relay_rstchan.stop	2017/02/13 16:52:47	1.2
@@ -2,6 +2,8 @@
 
 RST_IFACE="wlan1"
 
+[ -z "$RST_IFACE" ] && exit
+
 echo "Reset relay channel interface $RST_IFACE for DWDS-Client->DWDS-Base ..."
 
 ifconfig $RST_IFACE channel -1