Gives a database error when Aggregates only minus sign is clicked, Several courses affected.

Debug info: Data too long for column 'value' at row 1
UPDATE mdl_user_preferences SET value = ? WHERE id = ?
[array (
0 => 'a:2:{s:14:"aggregatesonly";a:8:

{i:0;s:2:"31";i:4;s:4:"1363";i:8;s:4:"1369";i:9;s:4:"1372";i:10;s:4:"1534";i:11;s:4:"1634";i:12;s:4:"1636";i:13;s:4:"1604";}

s:10:"gradesonly";a:6:{i:2;s:4:"1371";i:3;s:4:"1370";i:4;s:4:"1368";i:5;s:4:"1367";i:6;s:4:"1360";i:7;s:4:"1635";}}',
1 => '4949',
)]
Stack trace:
line 394 of /lib/dml/moodle_database.php: dml_write_exception thrown
line 1056 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->query_end()
line 1450 of /lib/dml/moodle_database.php: call to mysqli_native_moodle_database->set_field_select()
line 1418 of /lib/moodlelib.php: call to moodle_database->set_field()
line 1540 of /grade/report/grader/lib.php: call to set_user_preference()
line 104 of /grade/report/grader/index.php: call to grade_report_grader::process_action()