Trying to update a 3.0 db to 3.1 failed, because the function delete_posts() is called upon, which has "post_visibility" in its SQL query, although that field does not exist in 3.0 databases.

General Error
SQL ERROR [ mysqli ]

Unknown column 'post_visibility' in 'field list' [1054]

SQL

SELECT post_id, poster_id, post_visibility, post_postcount, topic_id, forum_id FROM phpbb_posts WHERE poster_id = 116837

BACKTRACE

FILE: (not given by php)
LINE: (not given by php)
CALL: msg_handler()

FILE: [ROOT]/phpbb/db/driver/driver.php
LINE: 809
CALL: trigger_error()

FILE: [ROOT]/phpbb/db/driver/mysqli.php
LINE: 187
CALL: phpbb_db_driver->sql_error()

FILE: [ROOT]/includes/functions_admin.php
LINE: 781
CALL: phpbb_db_driver_mysqli->sql_query()

FILE: [ROOT]/includes/functions_user.php
LINE: 564
CALL: delete_posts()

FILE: [ROOT]/phpbb/db/migration/data/30x/3_0_12_rc1.php
LINE: 111
CALL: user_delete()

FILE: (not given by php)
LINE: (not given by php)
CALL: phpbb_db_migration_data_30x_3_0_12_rc1->update_bots()

FILE: [ROOT]/phpbb/db/migrator.php
LINE: 446
CALL: call_user_func_array()

FILE: [ROOT]/phpbb/db/migrator.php
LINE: 392
CALL: phpbb_db_migrator->run_step()

FILE: [ROOT]/phpbb/db/migrator.php
LINE: 237
CALL: phpbb_db_migrator->process_data_step()

FILE: [ROOT]/phpbb/db/migrator.php
LINE: 153
CALL: phpbb_db_migrator->try_apply()