"Cannot use string offset as an array" with cac_lite

When accessing admin/access/cac_lite the following error is returned:
Fatal error: Cannot use string offset as an array in /var/www/localhost/htdocs/drupal/modules/system/system.module on line 1076

On investigating a bit, it seems this error is caused when system_settings_form is called from cac_lite.module. In system.module, the system_settings_form function only accepts one parameter, whereas the call to system_settings_form in cac_lite.module is parsing two.

Is there a fix to this?