Sounds like you've a broken database query somewhere. Could by a 3rd party CB plugin, 3rd party Joomla extension, or if you have something like CB Query Field a broken query in it. "list-type" database column doesn't exist anywhere in our code or in any of our products. My best guess is 3rd party system or user plugin in Extensions > Plugins trying to perform some sort of behavior after a Joomla user is created.