Convertor Error in MySQL

Version: Phpbb 2.0.22
Database: MySQL
Database Forum Space: 250 mb
Error in systems Windows & Linux

When I convert forum, in the step of "Filling table phpbb3_posts: " when the convertion is working, send me this problem:

General Error
SQL ERROR [ mysqli ]

MySQL server has gone away [2006]

SQL

UPDATE phpbb3_config SET config_value = 'a:3:

{s:4:\"step\";s:41:\"&current_table=15&skip_rows=77554\";s:12:\"table_prefix\";s:6:\"phpbb_\";s:3:\"tag\";s:7:\"phpbb20\";}

' WHERE config_name = 'convert_progress'

BACKTRACE

FILE: includes/db/mysqli.php
LINE: 143
CALL: dbal->sql_error()

FILE: includes/functions.php
LINE: 139
CALL: dbal_mysqli->sql_query()

FILE: install/install_convert.php
LINE: 1540
CALL: set_config()

FILE: install/install_convert.php
LINE: 1418
CALL: install_convert->save_convert_progress()

FILE: install/install_convert.php
LINE: 203
CALL: install_convert->convert_data()

FILE: install/index.php
LINE: 363
CALL: install_convert->main()

FILE: install/index.php
LINE: 235
CALL: module->load()