Phil and Ben,
ion_auth_model->update_user brings up an database error, if no field of the user table is in the $data-array.
Since I want to change username, password and email, I added an new if-condition:
if(array_key_exists('username', $data) OR array_key_exists('password', $data) OR array_key_exists('email', $data))
{
if(array_key_exists('password', $data))
{
$data['password'] = $this->hash_password($data['password']);
}
$this->db->where($this->ion_auth->_extra_where);
$this->db->update($this->tables['users'], $data, array('id' => $id));
}
