Django: The group owner is marked with X and appear to be possible to remove from the group and throws 'Undefined' error when tries to save

The group owner appears similar to every other user in the group. With the name appears 'x' suggesting that the owner also could be removed. But throws and undefined error when tried to and also if checked the owner is not removed (which is actually the correct approach)

Make the owner to appear 'grayed' or without the 'x' so by looking users know he cannot be removed. Also the owner to be marked as 'owner'