[TYPO3-mvc] Easy query results in Error 500

[Stefan Frömken]

Hello MVC-List,

I have a very simple Query:

$query = $this->createQuery();
$query->setQuerySettings($query->getQuerySettings()->setRespectStoragePage(FALSE));
$query->matching($query->equals('pid', $uid))->execute();

and there are no problem within LIVE-Workspace.

But when I'm in a workspace I got an error 500. On my local DEV-System 
my Firefox crashes after 30-40 seconds.

And ideas how/where to debug this?!

We are working with TYPO3 4.5.7

Stefan