Error on extension management page after install

[bonelifer]

Get this in the extension management page just after it is installed. Otherwise it's working on phpBB 3.3.12.

[phpBB Debug] PHP Warning: in file [ROOT]/phpbb/db/tools/tools.php on line 1033: Undefined array key 1 [phpBB Debug] PHP Warning: in file [ROOT]/phpbb/db/tools/tools.php on line 1048: Undefined array key 1 [phpBB Debug] PHP Warning: in file [ROOT]/phpbb/db/tools/tools.php on line 1053: Undefined array key 1 [phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_acp.php on line 139: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3035) [phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_acp.php on line 139: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3035) [phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_acp.php on line 139: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3035) [phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_acp.php on line 139: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3035)