Error when try to add a new glossary entry

When I try to add a new entry, in FAQ style glosary, at Moodle QA (as test teacher and student), I can edit it, but when I click "Save changes", it shows this

Error: Field "LOWER(concept)" does not exist in table "glossary_entries" and : Stack trace:

• line 508 of /lib/dml/moodle_database.php: dml_exception thrown
• line 1207 of /lib/dml/moodle_database.php: call to moodle_database->where_clause()
• line 124 of /mod/glossary/edit_form.php: call to moodle_database->get_record()
• line 438 of /lib/formslib.php: call to mod_glossary_entry_form->validation()
• line 397 of /lib/formslib.php: call to moodleform->validate_defined_fields()
• line 484 of /lib/formslib.php: call to moodleform->is_validated()
• line 88 of /mod/glossary/edit.php: call to moodleform->get_data()