MySQL Statement is not working in PHP but works perfectly fine in MySQL Workbench

Question

If I try to execute it in the MySQL Workbench, it just works. However, it does not work when executet through the php script. I am using MySQLi. The php script throws this Error Message:

You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'DELETE FROM admins WHERE id = 2' at line 5

This is the Code from the php file:

function deleteAdmin($connection, $id_admin) {
  $sqlStmt = "UPDATE azubis 
              SET fk_ausbilder = 1 
              WHERE fk_ausbilder = $id_admin; 
              
              DELETE FROM admins 
              WHERE id = $id_admin";
              
  if (!$connection->query($sqlStmt)) {
    echo mysqli_error($connection);
  }
  closeConnection($connection);
}