0.7.8 and 0.7.7 exception: pymysql.err.InternalError: Packet sequence number wrong - got 142 expected 1 #512

import pymysql.cursors

connection = pymysql.connect(host='localhost',
                             user='root',
                             password='123456',
                             db='wikiurl',
                             charset='utf8mb4')

try:
    with connection.cursor() as cursor:
        sql = "select urlname, urlhref from urls where id is not null"
        conut = cursor.execute(sql)
        print(conut)
finally:
    connection.close()