error handling - TYPO3: How to handle missing typeNum? -

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when given typenum not configured in typoscript, typo3 throw exception/cms/1294587217.

background: after moving system typo3 have lot of these exceptions type param used there form field, search engines still stores many links domain users meet "oooops, error occurred" page

i'd handle myself i.e. redirecting 404 page instead displaying error (fide pagenotfound_handling), there ready use solution or should create handler myself , interact requests typenum > 0 ?

apparently i'm looking pageunavailable_handling:

$globals['typo3_conf_vars']['fe']['pageunavailable_handling']  = 'redirect:/404.html';

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