diff --git a/omr-tracker/files/bin/omr-tracker-server b/omr-tracker/files/bin/omr-tracker-server
index d83ccfc64..f518aff37 100755
--- a/omr-tracker/files/bin/omr-tracker-server
+++ b/omr-tracker/files/bin/omr-tracker-server
@@ -249,7 +249,7 @@ _check_master() {
 				[ -n "$script_alert_up" ] && eval $script_alert_up
 				count=$((count+1))
 			else
-				[ -z "$(logread | tail -n 10 | grep "Master server ${name} down" | grep $ip)" ] && logger -t "OMR-Tracker-Server" "Master server ${name} down ($ip)"
+				[ -n "$ip" ] && [ -z "$(logread | tail -n 10 | grep "Master server ${name} down" | grep "$ip")" ] && logger -t "OMR-Tracker-Server" "Master server ${name} down ($ip)"
 				OMR_TRACKER_STATUS_MSG="No answer to ping and API check"
 				servername=""
 				config_load shadowsocks-libev
@@ -428,7 +428,7 @@ _check_backup() {
 				[ -n "$script_alert_up" ] && eval $script_alert_up
 				count=$((count+1))
 			else
-				[ -z "$(logread | tail -n 10 | grep "Backup server ${name} down" | grep $ip)" ] && logger -t "OMR-Tracker-Server" "Backup server ${name} down ($ip)"
+				[ -n "$ip" ] && [ -z "$(logread | tail -n 10 | grep "Backup server ${name} down" | grep "$ip")" ] && logger -t "OMR-Tracker-Server" "Backup server ${name} down ($ip)"
 				uci -q batch <<-EOF >/dev/null
 					set openmptcprouter.${name}.current='0'
 					commit openmptcprouter