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Prevent internal server error 500 when URL contains some special characters like ##??

Last Modified: 2013-12-25

When testing a site, i encountered an internal server error (500), when adding multiple # or ? to the url.
The url structure =

The title does 'nothing', you can change this to anything you like, except when adding multiple #'s or ?'s. Then a internal server error is encountered.

Also, the customized 500 error page is not shown, instead a default browser error page is shown.

1. Why do i get this error? As this part of the url, the pagetitle, is not used to load page data or alike.
2. how can i prevent this error notice, and just serve a 404 page or something?

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