[Plugin: More Types] Call to member function on a non-object add_cap()

this hack from https://www.ads-software.com/support/topic/plugin-more-types-fatal-error-call-to-a-member-function-add_cap

seems to work

on line 139

Change: $wp_roles->add_cap($role, $capability);

To:
if(is_object($mp_roles) && method_exists($wp_roles,’add_cap’))
{
$wp_roles->add_cap($role, $capability);
}

Is there a development version of this plugin so we can push changes? and then the authors push it to the master?