my ($self) = @_;
# this query will fail if column already exist (new database)
- $self->db_query(qq|ALTER TABLE defaults ADD COLUMN payments_changeable integer NOT NULL DEFAULT 0|, 1);
+ $self->db_query(qq|ALTER TABLE defaults ADD COLUMN payments_changeable integer NOT NULL DEFAULT 0|, may_fail => 1);
# check current configuration and set default variables accordingly, so that
# kivitendo behaviour isn't changed by this update