Querying mysql.slow_log table might cause UnicodeDecodeError

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xed in position 6795: invalid continuation byte   

SystemError: <class 'UnicodeDecodeError'> returned a result with an error set

The above exception was the direct cause of the following exception:

Traceback (most recent call last):

  File "./query_slow_log.py", line 13, in <module>

    main()

  File "./query_slow_log.py", line 9, in main

    cur.fetchall()

SystemError: <method 'fetchall' of 'mariadb.connection.cursor' objects> returned a result with an error set

#!/usr/bin/env python3

import mariadb

def main():

    conn = mariadb.connect()

    cur = conn.cursor()

    cur.execute("SELECT * FROM mysql.slow_log")

    cur.fetchall()

    conn.close()

if __name__=='__main__':

    main()