Error messages upon clean installation

Hello,

Immediately after installing the plug-in and accessing the Settings page, I get the following error notification:

Notice: Undefined index: bus311mtd_hidden in /var/www/vhosts/<name>/httpdocs/<name>/wp-content/plugins/abase/abase_plugin_options.php on line 31

ABASE for Accessing MySQL Databases
Settings and Reference

Notice: Undefined variable: create_databases in /var/www/vhosts/<name>/httpdocs/<name>/wp-content/plugins/abase/abase_plugin_options.php on line 223

After enabling ‘Expand to full settings (9 databases)’ settings, I get more error notifications:

Notice: Undefined variable: create_databases in /var/www/vhosts/<name>/httpdocs/<name>/wp-content/plugins/abase/abase_plugin_options.php on line 87

Notice: Undefined variable: create_databases in /var/www/vhosts/<name>/httpdocs/<name>/wp-content/plugins/abase/abase_plugin_options.php on line 87

Notice: Undefined variable: create_databases in /var/www/vhosts/<name>/httpdocs/<name>/wp-content/plugins/abase/abase_plugin_options.php on line 87

Notice: Undefined variable: create_databases in /var/www/vhosts/<name>/httpdocs/<name>/wp-content/plugins/abase/abase_plugin_options.php on line 87

Notice: Undefined variable: create_databases in /var/www/vhosts/<name>/httpdocs/<name>/wp-content/plugins/abase/abase_plugin_options.php on line 87

Notice: Undefined variable: create_databases in /var/www/vhosts/<name>/httpdocs/<name>/wp-content/plugins/abase/abase_plugin_options.php on line 87

Notice: Undefined variable: create_databases in /var/www/vhosts/<name>/httpdocs/<name>/wp-content/plugins/abase/abase_plugin_options.php on line 87

Notice: Undefined variable: create_databases in /var/www/vhosts/<name>/httpdocs/<name>/wp-content/plugins/abase/abase_plugin_options.php on line 87

Notice: Undefined variable: create_databases in /var/www/vhosts/<name>/httpdocs/<name>/wp-content/plugins/abase/abase_plugin_options.php on line 87

Notice: Undefined index: bus311mtd_disable_wptexturize in /var/www/vhosts/<name>/httpdocs/<name>/wp-content/plugins/abase/abase_plugin_options.php on line 99

It works completely fine on another WordPress installation, but my second one is somehow giving problems. Please advice how to proceed or solve the issue.