Notice: Undefined index: submit in ip-ban.php on line 37

Hi,

first of all many thanks for this very useful plugin.

What I spotted is not actually a bug, I just get a notice on the plugin option page:
Notice: Undefined index: submit in path\to\ip-ban.php on line 37

server’s PHP Version 5.3.13

To fix it I replaced line 37:
if ($_POST['submit']) {
by
if (isset($_POST['submit'])) {

No notice anymore and the plugin works just fine ??

Is there any Simple IP Ban repo to work on?

Adam

https://www.ads-software.com/plugins/simple-ip-ban/