PHP Notice with WP_DEBUG set to true in simpar_import_admin.php

On lines 3 and 95 of simpar_import_admin.php, it is being assumed that $_POST['simpar_push_hidden'] is present. It looks like:

if ( $_POST['simpar_push_hidden'] == 'Y'  ) {
// etc...
}

Should read:

if ( isset( $_POST['simpar_push_hidden'] ) && ( $_POST['simpar_push_hidden'] == 'Y' ) ) {
// etc...
}

On both lines.

https://wordpress.org/plugins/simple-parse-push-service/