[TYPO3] problem after 4.0.3 to 4.1.3 upgrade

[Jozef Uhliarik]

Can you help me? When I enter to extension manager these errors appear:

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result 
resource in 
/home/clients/webserver.com/typo3_src-4.1.3/t3lib/class.t3lib_db.php on line 
796

Warning: mysql_free_result(): supplied argument is not a valid MySQL result 
resource in 
/home/clients/webserver.com/typo3_src-4.1.3/t3lib/class.t3lib_db.php on line 
823