Admin Interface Broken

There appears to be a bug in the admin interface for this plug-in (running on 3.4.2). All of the checkboxes under "Options" are throwing errors similar to the following error:

Notice: Undefined index: show-registration-templates in /[Redacted]/wp-content/plugins/blogtemplates/blogtemplatesfiles/blog_templates.php on line 800

Call Stack:
    0.0009     845976   1. {main}() /[Redacted]/wp-admin/network/settings.php:0
    0.0010     856936   2. require_once('/[Redacted]/wp-admin/network/admin.php') /[Redacted]/wp-admin/network/settings.php:11
    0.0016     974696   3. require_once('/[Redacted]/wp-admin/admin.php') /[Redacted]/wp-admin/network/admin.php:13
    0.4831   48556536   4. do_action() /[Redacted]/wp-admin/admin.php:151
    0.4831   48558104   5. call_user_func_array() /[Redacted]/wp-includes/plugin.php:403
    0.4831   48558136   6. blog_templates->admin_options_page() /[Redacted]/wp-includes/plugin.php:403

These errors make the interface completely unusable.