diff --git a/wol/scripts/wakeonlanservice.sh b/wol/scripts/wakeonlanservice.sh
index 62828a4ed74cfc590fa6aba89f3d7527239a2c79..f76e82fff8873d262de29892d745cd4bac7429de 100755
--- a/wol/scripts/wakeonlanservice.sh
+++ b/wol/scripts/wakeonlanservice.sh
@@ -52,6 +52,10 @@ do
         do
             mac=$(echo $line | cut -d ' ' -f 2)
             IPS=$(getip $mac | sed -e 's/ /,/g')
+            if [ -z "$IPS" ]
+            then
+                IPS="NA"
+            fi
             echo "$line $IPS" >> $hostfile-$$
         done < $hostfile
         stdbuf -oL cat $hostfile-$$ | netcat $host $port