When you want to see the submissions of an assignment using visible groups mode and you click on the "View X submitted assignments" link you get an 'Error reading from database' message:

e.g.

Debug info: ERROR: column "status" does not exist at character 467
SELECT u.id,u.picture,u.firstname,u.lastname,u.imagealt,u.email,
s.id AS submissionid, s.grade, s.submissioncomment,
s.timemodified, s.timemarked FROM mdl_user u LEFT JOIN mdl_assignment_submissions s ON u.id = s.userid
AND s.assignment = 1329 WHERE u.id IN (11399,395,9660,3125,2675,13744,5234,2144,2510,12783,13603,4836,10865,2522,2567,3050,6448,13717,6396,2460,14207,2122) ORDER BY status ASC, lastname ASC
[array (
)]
Stack trace:
line 394 of /lib/dml/moodle_database.php: dml_read_exception thrown
line 232 of /lib/dml/pgsql_native_moodle_database.php: call to moodle_database->query_end()
line 678 of /lib/dml/pgsql_native_moodle_database.php: call to pgsql_native_moodle_database->query_end()
line 1321 of /mod/assignment/lib.php: call to pgsql_native_moodle_database->get_records_sql()
line 645 of /mod/assignment/lib.php: call to assignment_base->display_submissions()
line 369 of /mod/assignment/type/upload/assignment.class.php: call to assignment_base->submissions()
line 57 of /mod/assignment/submissions.php: call to assignment_upload->submissions()