Unable to upgrade 3.0 QI-installed board to 3.1

1. QI-install a board.
2. Overwrite with develop tree.
3. Run database updater.

Fatal error: SQL ERROR [ postgres ]

ERROR: relation "phpbb_ext" does not exist LINE 2: FROM phpbb_ext ^ []

SQL

SELECT * FROM phpbb_ext in /var/www/qi/boards/x32/includes/db/dbal.php on line 809

Going to the board produces:

SQL ERROR [ postgres ]

ERROR: relation "phpbb_ext" does not exist LINE 2: FROM phpbb_ext ^ []

SQL

SELECT * FROM phpbb_ext

BACKTRACE

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

FILE: [ROOT]/includes/db/dbal.php
LINE: 809
CALL: trigger_error()

FILE: [ROOT]/includes/db/postgres.php
LINE: 210
CALL: dbal->sql_error()

FILE: [ROOT]/includes/extension/manager.php
LINE: 73
CALL: dbal_postgres->sql_query()

FILE: [ROOT]/includes/extension/manager.php
LINE: 59
CALL: phpbb_extension_manager->load_extensions()

FILE: (not given by php)
LINE: (not given by php)
CALL: phpbb_extension_manager->__construct()

FILE: /home/pie/apps/git-phpbb3-dependencies/Symfony/Component/DependencyInjection/ContainerBuilder.php
LINE: 754
CALL: ReflectionClass->newInstanceArgs()

FILE: /home/pie/apps/git-phpbb3-dependencies/Symfony/Component/DependencyInjection/ContainerBuilder.php
LINE: 349
CALL: Symfony\Component\DependencyInjection\ContainerBuilder->createService()

FILE: [ROOT]/common.php
LINE: 127
CALL: Symfony\Component\DependencyInjection\ContainerBuilder->get()

FILE: [ROOT]/index.php
LINE: 19
CALL: include('[ROOT]/common.php')

Database updater must function without ext table existing.