@@ -249,7 +249,11 @@ function make_cert {

     if [ "$common_name" != "$SERVICE_HOST" ]; then

         if is_ipv4_address "$SERVICE_HOST" ; then

-            alt_names="$alt_names,IP:$SERVICE_HOST"

+            if [[ -z "$alt_names" ]]; then

+                alt_names="IP:$SERVICE_HOST"

+            else

+                alt_names="$alt_names,IP:$SERVICE_HOST"

+            fi

         fi

     fi