Editing quiz: Quiz

Help with thisThe basic ideas of quiz-making
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Error reading from database

More information about this error

Debug info: ERROR: invalid input syntax for integer: ""
SELECT q.*,c.contextid
FROM mdl_question q,
mdl_question_categories c
WHERE q.id IN ($1,$2)
AND q.category = c.id
[array (
0 => '',
1 => '0',
Stack trace:
  • line 391 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 672 of /lib/dml/pgsql_native_moodle_database.php: call to pgsql_native_moodle_database->query_end()
  • line 358 of /mod/quiz/editlib.php: call to pgsql_native_moodle_database->get_records_sql()
  • line 518 of /mod/quiz/edit.php: call to quiz_print_question_list()
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