Can't add Bjergsen

Accidentally switched Bjergsen with someone now I can't pick him up again. I can pick up other mid laners perfectly fine but then when I add say Jesiz and try to trade him with Bjergsen Jesiz will be dropped but Bjergsen won't be added. It keeps saying internal server error. I attached screenshots as well. I have seen this happen with other players such as altec so hoping this gets fixed