Tuesday night was the first semi-final of Eurovision, and number 14 in the row was Croatia with the song "Poison Cake"
But when voting for Croatia, several people received the following response:
"Thank you for voting for Israel".
Israel is not part of tonight's semi-final, but will appear as number 14 on Thursday.
However, the European Broadcasting Union (EBU) can reassure those who thought their vote was not registered. Just before 01 Norwegian time, the EBU says in a statement that the votes were correctly registered and that the error did not affect the result.