[TYPO3] error: Warning: mysql_fetch_assoc()

[Camilla]

I have a problem when I delete a page - an error occures:

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result 
resource in /var/lib/typo3/typo3_src-4.0.2/t3lib/class.t3lib_db.php on line 
801

Warning: Cannot modify header information - headers already sent by (output 
started at /var/lib/typo3/typo3_src-4.0.2/t3lib/class.t3lib_db.php:801) in 
/var/lib/typo3/typo3_src-4.0.2/typo3/tce_db.php on line 225

Can somebody please help?

-- 
Best Regards

Camilla