[TYPO3-english] ERROR-message: class.t3lib_tcemain.php on line 7083

[Stephan Bernhard]

hi list

lately i receive an error message which i don't understand and do not 
know what to do against (TYPO3 version 4.4.14):

Fatal error: Call to a member function writelog() on a non-object in 
/.../typo3-source/typo3_src-4.5.14/t3lib/class.t3lib_tcemain.php on line 
7083

after reloading the page it will display properly.

any hints and any help?
thanks
stephan