1. Create a custom profile field "dropdownlist"
   1. name: TEST 
   2. required: no
   3. locked: yes
   4. unique: no
2. In Shibbolelth auth paramters:
   1. leave field_updatelocal_profile_field_TEST empty
3. Connect with a user
   1. if you set the field TEST to be updated at creation, the error only appears at creation
   2. if you set the field TEST to be updated at each connections, the error appears at each connections...

Error: Shibboleth plugin seems to try to update the fields even if the data source field is empty.

ERROR LOG:

[28-Sep-2017 10:41:01 Europe/Brussels] Default exception handler: Erreur d'écriture vers la base de données Debug: Column 'data' cannot be null
UPDATE mdl_user_info_data SET userid = ?,fieldid = ?,data = ? WHERE id=?
[array (
0 => '18752',
1 => '1',
2 => NULL,
3 => '18945',
)]
Error code: dmlwriteexception

• line 489 of /lib/dml/moodle_database.php: dml_write_exception thrown
• line 1502 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->query_end()
• line 1534 of /lib/dml/mysqli_native_moodle_database.php: call to mysqli_native_moodle_database->update_record_raw()
• line 155 of /user/profile/lib.php: call to mysqli_native_moodle_database->update_record()
• line 523 of /user/profile/lib.php: call to profile_field_base->edit_save_data()
• line 3961 of /lib/moodlelib.php: call to profile_save_data()
• line 4330 of /lib/moodlelib.php: call to update_user_record_by_id()
• line 54 of /auth/shibboleth/index.php: call to authenticate_user_login()