[BUGFIX] Fix error with accessing non-existent array keys

Classes/Updates/VisibilitySettingsAllLanguagesMigrationWizard.php

@@ -160,7 +160,7 @@ class VisibilitySettingsAllLanguagesMigrationWizard implements UpgradeWizardInte
 								'tx_languagevisibility_visibility_flag'
 							);
 
-							$visibilitySetting = $localVisibilitySettings[$lid];
+							$visibilitySetting = $localVisibilitySettings[$lid] ?? NULL;
 							if ($visibilitySetting) {
 
 								// the pid should always be the default language page
@@ -287,7 +287,7 @@ class VisibilitySettingsAllLanguagesMigrationWizard implements UpgradeWizardInte
 			$table
 		);
 
-		if ($GLOBALS['TCA'][$table]['ctrl']['enable_columns']) {
+		if (array_key_exists('enable_colums', $GLOBALS['TCA'][$table]['ctrl'])) {
 
 			//remove restrictions so that hidden records also get migrated
 			$queryBuilder