TYPO3 Flow Base Distribution

If I save a Query-Result in a WidgetController and afterwards call $result->getQuery->execute() I receive an empty result, because of the try-catch block around the execute call which simply returns an empty result in case of an exception.

The problem seems to be in the __wakeup() method of \TYPO3\FLOW3\Persistence\Doctrine\Query

    public function __wakeup() {
        $this->queryBuilder->where($this->constraint);

everything works fine, if I inject a condition like this:

    public function __wakeup() {
        if ($this->constraint)
            $this->queryBuilder->where($this->constraint);