Error 1193 is issued twice

MariaDB [archivafea]> SET GLOBAL x = 1;

ERROR 1193 (HY000): Unknown system variable 'x'

MariaDB [archivafea]> SHOW ERRORS;

+-------+------+-----------------------------+

| Level | Code | Message                     |

+-------+------+-----------------------------+

| Error | 1193 | Unknown system variable 'x' |

| Error | 1193 | Unknown system variable 'x' |

+-------+------+-----------------------------+

2 rows in set (0.00 sec)