When navigating to /mod/choicegroup/index.php:

Debug info: Table 'moodle.m_choicegroup_answers' doesn't exist
SELECT cha.*
FROM m_choicegroup ch, m_choicegroup_answers cha
WHERE cha.choicegroupid = ch.id AND
ch.course = ? AND cha.userid = ?
[array (
0 => '4',
1 => '2',
)]
Error code: dmlreadexception
Stack trace:

line 407 of /lib/dml/moodle_database.php: dml_read_exception thrown
line 864 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->query_end()
line 42 of /mod/choicegroup/index.php: call to mysqli_native_moodle_database->get_records_sql()