[TASK] Fixing php storm warning

Classes/Controller/AbstractBackendController.php

@@ -182,7 +182,7 @@ abstract class AbstractBackendController extends AbstractController {
 			'override' => LocalizationUtility::translate('select.editingMode.override', 'lfeditor'),
 		);
 
-		$backendConfiguration = unserialize($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf']['lfeditor']);
+		$backendConfiguration = unserialize($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf']['lfeditor'], NULL);
 		if ((int)$backendConfiguration['editModeExtension'] === 0) {
 			unset($editingModeOptions['extension']);
 		}