[TYPO3-english] error message crawler

[Stephan Bernhard]

hi list

there is an error message from crawler which i don't understand and 
don't know how to stop it:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to 
allocate 37793 bytes) in 
/[web-address]/t3lib/class.t3lib_tsparser_tsconfig.php on line 67

i have not found any hint here nor elsewhere.

interestingly the crawler is doing his job, but just at the beginning 
throws this error.

crawler and indexing is scheduled through EXT scheduler.

thanks for help and hint
stephan