This appears in my Recent activity block:

ERROR: column "sa.time" must appear in the GROUP BY clause or be used in an aggregate function

SELECT sa.userid, sa.survey, sa.time, u.firstname, u.lastname, u.email, u.picture FROM mdl_survey_answers sa JOIN mdl_user u ON u.id = sa.userid WHERE sa.survey IN (9) AND sa.time > 1209238600 GROUP BY sa.userid, sa.survey ORDER BY sa.id ASC

• line 686 of lib/dmllib.php: call to debugging()
• line 162 of mod/survey/lib.php: call to get_recordset_sql()
• line 942 of course/lib.php: call to survey_print_recent_activity()
• line 27 of blocks/recent_activity/block_recent_activity.php: call to print_recent_activity()
• line 317 of blocks/moodleblock.class.php: call to block_recent_activity->get_content()
• line 341 of blocks/moodleblock.class.php: call to block_base->is_empty()
• line 338 of lib/blocklib.php: call to block_base->_print_block()
• line 284 of course/format/topics/format.php: call to blocks_print_group()
• line 226 of course/view.php: call to require()