[Zope] error with simple python script loop

[Christian Steinhauer]

>>As I said in the tracker, no one can help you if you don't 
>>actually give us the full traceback and exception that you got.

There is no traceback, i got no error - thats why i have post it into
bug tracker. I spoke to many people but no one can tell me why it
occured. The most said that it must be a bug in zope or python. 

@Maciej: I call the script simple over url or the "test" button - it is
a script for testing only - it is not called by any other script