Comments - MariaDB 10.1.21 silently skipping INSERTs

It turns out that the following trigger causes the INSERT to silently fail:

CREATE TRIGGER `beforeSupplierItemsInsert`
BEFORE INSERT ON `supplierItems`
FOR EACH ROW
  BEGIN

    IF NEW.status = 'expired' THEN
      SET NEW.dateExpired = UNIX_TIMESTAMP();
    END IF;

    IF NOT NEW.dateUpdated THEN
      SET NEW.dateUpdated = UNIX_TIMESTAMP();
    END IF;

  END