Can you open applications/autowelcome/setup/upg_100201/upgrade.php
Find:
\IPS\Db::i()->insert( 'autowelcome_members', array(
'welcome_member_id' => $member['member_id'],
'welcome_sent' => 1,
) );
Replace With:
\IPS\Db::i()->insert( 'autowelcome_members', array(
'welcome_member_id' => $member['member_id'],
'welcome_sent' => 1,
), TRUE );
And try re-running the upgrade again?