TYPO3 Core

I have the Error:

Uncaught TYPO3 Exception
#1: PHP Warning: trim() expects parameter 1 to be string, array given in /home/shared_typo3/typo3_source/typo3_src-6.2.11/typo3/sysext/frontend/Classes/Page/PageRepository.php line 1416 (More information)

TYPO3\CMS\Core\Error\Exception thrown in file
/home/shared_typo3/typo3_source/typo3_src-6.2.11/typo3/sysext/core/Classes/Error/ErrorHandler.php in line 101.

20 TYPO3\CMS\Core\Error\ErrorHandler::handleError(2, "trim() expects parameter 1 to be string, array given", "/home/shared_typo3/typo3_source/typo3_src-6.2.11/t…o3/sysext/frontend/Classes/Page/PageRepository.php", 1416, array)
19 trim(array)

/home/shared_typo3/typo3_source/typo3_src-6.2.11/typo3/sysext/frontend/Classes/Page/PageRepository.php:
01414: }
01415:
01416: if ($checkValue === array() || trim($checkValue) === '') {
01417: $shouldFieldBeOverlaid = FALSE;
01418: }

The Array has one FileReference (media) from pages_language_overlay.

array(1 item)
   0 => TYPO3\CMS\Core\Resource\FileReferenceprototypeobject
      propertiesOfFileReference => array(32 items)
      uidOfFileReference => NULL
      name => NULL
      originalFile => TYPO3\CMS\Core\Resource\Fileprototypeobject
      mergedProperties => array(empty)

If have the Option: $GLOBALS['TCA']['pages_language_overlay']['columns']['media']['l10n_mode'] = 'mergeIfNotBlank';

related to Core #60998