在重复键更新上插入...不起作用

Question

此代码工作正常，但在上周停止工作。有什么建议吗？

$PlayerDataInsert = "INSERT INTO PlayerData 
                        SET PersonID = '$PersonID'
                          , CallUp = '$CallUp' 
                        ON DUPLICATE KEY 
                          UPDATE CallUp = '$CallUp'"; 
IF (!$update = mysqli_query($cxn, $PlayerDataInsert)) 
{ 
  echo "Something went dreadfully wrong!!! Player Data" 
}