diff --git a/package/optware/S50smartdns b/package/optware/S50smartdns
index 3a3d5d3..052d3db 100644
--- a/package/optware/S50smartdns
+++ b/package/optware/S50smartdns
@@ -52,9 +52,9 @@ clear_iptable()
 
 restart_dnsmasq()
 {
-	CMD="`ps | grep "  dnsmasq" | grep -v grep`"
+	CMD="`ps | grep "  dnsmasq" | grep -v grep 2>/dev/null`"
 	if [ -z "$CMD" ]; then
-		CMD="`ps ax | grep dnsmasq | grep -v grep`"
+		CMD="`ps ax | grep dnsmasq | grep -v grep 2>/dev/null`"
 	fi
 
 	if [ -z "$CMD" ]; then