diff --git a/xCAT/postscripts/confignics b/xCAT/postscripts/confignics
index b25163c94..4fc91aae6 100755
--- a/xCAT/postscripts/confignics
+++ b/xCAT/postscripts/confignics
@@ -203,7 +203,7 @@ do
         echo "confignics on $NODE: processing custom scripts: ${array_temp[3]} for interface $key"
         ${array_temp[3]}
     else
-        if [ -n "${array_temp[2]}" ];then
+        if [ -z "${array_temp[2]}" ];then
             logger -t xcat -p local4.info "confignics: ip address,nic type and network are required. $key: $str_value ."
             echo "confignics on $NODE: ip address,nic type and network are required. $key: $str_value ."
             continue