[BUGFIX] FAL: Prevent invalid NULL value on metadata creation

The cruser_id field is now guaranteed to be an integer.
This patch checks if a BE_USER is available and uses zero
otherwise.

Resolves: #57495
Related: #46020
Releases: 6.2
Change-Id: I8260604eb30ca32d2a5e079fa6f5b10a6d04714e
Reviewed-on: https://review.typo3.org/29028
Reviewed-by: Nicole Cordes
Reviewed-by: Jigal van Hemert
Reviewed-by: Frans Saris
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind
Reviewed-by: Alexander Opitz
Tested-by: Alexander Opitz
Reviewed-by: Markus Klein
Tested-by: Markus Klein

typo3/sysext/core/Classes/Resource/Index/MetaDataRepository.php

@@ -115,7 +115,7 @@ class MetaDataRepository implements SingletonInterface {
 			'pid' => 0,
 			'crdate' => $GLOBALS['EXEC_TIME'],
 			'tstamp' => $GLOBALS['EXEC_TIME'],
-			'cruser_id' => TYPO3_MODE == 'BE' ? $GLOBALS['BE_USER']->user['uid'] : 0
+			'cruser_id' => isset($GLOBALS['BE_USER']->user['uid']) ? (int)$GLOBALS['BE_USER']->user['uid'] : 0
 		);
 		$emptyRecord = array_merge($emptyRecord, $additionalFields);
 		$this->getDatabaseConnection()->exec_INSERTquery($this->tableName, $emptyRecord);

typo3/sysext/core/Classes/Resource/Service/IndexerService.php

@@ -136,7 +136,7 @@ class IndexerService implements \TYPO3\CMS\Core\SingletonInterface {
 					'crdate' => $GLOBALS['EXEC_TIME'],
 					'tstamp' => $GLOBALS['EXEC_TIME']
 				);
-				if (TYPO3_MODE === 'BE') {
+				if (isset($GLOBALS['BE_USER']->user['uid'])) {
 					$additionalInfo['cruser_id'] = (int)$GLOBALS['BE_USER']->user['uid'];
 				}
 				$indexRecord = array_merge($fileInfo, $additionalInfo);