SQL ERROR [ mysqli ]Lost connection to MySQL server during query [2013]SQLALTER TABLE phpbb_posts ADD FULLTEXT post_text (post_text)BACKTRACEFILE: (not given by php)

LINE: (not given by php)

CALL: msg_handler()FILE: [ROOT]/phpbb/db/driver/driver.php

LINE: 997

CALL: trigger_error()FILE: [ROOT]/phpbb/db/driver/mysqli.php

LINE: 193

CALL: phpbb\db\driver\driver->sql_error()FILE: [ROOT]/phpbb/db/driver/factory.php

LINE: 329

CALL: phpbb\db\driver\mysqli->sql_query()FILE: [ROOT]/phpbb/search/fulltext_mysql.php

LINE: 1058

CALL: phpbb\db\driver\factory->sql_query()FILE: [ROOT]/includes/acp/acp_search.php

LINE: 369

CALL: phpbb\search\fulltext_mysql->create_index()FILE: [ROOT]/includes/acp/acp_search.php

LINE: 46

CALL: acp_search->index()FILE: [ROOT]/includes/functions_module.php

LINE: 676

CALL: acp_search->main()FILE: [ROOT]/adm/index.php

LINE: 82

CALL: p_master->load_active()