When Jenny transferred functions from questionnaire/lib to locallib, she changed the order of the SELECT fields, which results in this error message when creating a questionnaire on a site with existing template or public questionnaires:

Did you remember to make the first column something unique in your call to get_records? Duplicate value '5' found in column 'id'.

line 1014 of \lib\dml\mysqli_native_moodle_database.php: call to debugging()
line 433 of \mod\questionnaire\locallib.php: call to mysqli_native_moodle_database->get_records_sql()
line 440 of \mod\questionnaire\locallib.php: call to questionnaire_get_survey_list()
line 115 of \mod\questionnaire\mod_form.php: call to questionnaire_get_survey_select()
line 191 of \lib\formslib.php: call to mod_questionnaire_mod_form->definition()
line 71 of \course\moodleform_mod.php: call to moodleform->moodleform()
line 248 of \course\modedit.php: call to moodleform_mod->moodleform_mod()

Easy fix: revert to original order of SELECT fields as per version 2.3.