When I activate, I get the error below. It appears that the UI is installed, but doesn't function. Every time there's a loggable event I get the same message, including deactivating. Can't delete the plugin "Plugin could not be deleted due to an error: Could not fully remove the plugin(s) simple-history/index.php."
WordPress database error Incorrect integer value: '' for column 'object_id' at row 1 for query INSERT INTO wp_simple_history SET date = '2014-03-13 00:36:08', action = 'activated', object_type = 'plugin', object_subtype = '', user_id = '2', object_id = '', object_name = 'Simple History', action_description = '' made by activate_plugin, do_action('activate_simple-history/index.php')