diff --git a/typo3/sysext/backend/Classes/Controller/PageLayoutController.php b/typo3/sysext/backend/Classes/Controller/PageLayoutController.php
index e8f27c4f3ebda5e27b58484cc192df315fafb5e7..a3da75a4211335f5f08ed4b2825fcde59d63b456 100644
--- a/typo3/sysext/backend/Classes/Controller/PageLayoutController.php
+++ b/typo3/sysext/backend/Classes/Controller/PageLayoutController.php
@@ -590,7 +590,7 @@ class PageLayoutController
                     $this->colPosList = implode(',', $backendLayout->getColumnPositionNumbers());
                 }
                 // Removing duplicates, if any
-                $colPosArray = array_unique(GeneralUtility::intExplode(',', $this->colPosList));
+                $colPosArray = array_unique(GeneralUtility::intExplode(',', $this->colPosList, true));
                 // Accessible columns
                 if (isset($this->modSharedTSconfig['properties']['colPos_list']) && trim($this->modSharedTSconfig['properties']['colPos_list']) !== '') {
                     $activeColPosArray = array_unique(GeneralUtility::intExplode(',', trim($this->modSharedTSconfig['properties']['colPos_list'])));
diff --git a/typo3/sysext/backend/Classes/ViewHelpers/LanguageColumnViewHelper.php b/typo3/sysext/backend/Classes/ViewHelpers/LanguageColumnViewHelper.php
index 66b811b65fd9717aa3a698ca8be5a37096e335dd..f332562b57303b9b2bc617bd8492746ef38bfa17 100644
--- a/typo3/sysext/backend/Classes/ViewHelpers/LanguageColumnViewHelper.php
+++ b/typo3/sysext/backend/Classes/ViewHelpers/LanguageColumnViewHelper.php
@@ -29,8 +29,8 @@ class LanguageColumnViewHelper extends AbstractViewHelper
         $this->registerArgument('columnNumber', 'int', 'Number (colPos) of column within LanguageColumn to be returned', true);
     }
 
-    public function render(): GridColumn
+    public function render(): ?GridColumn
     {
-        return $this->arguments['languageColumn']->getGrid()->getColumns()[$this->arguments['columnNumber']];
+        return $this->arguments['languageColumn']->getGrid()->getColumns()[$this->arguments['columnNumber']] ?? null;
     }
 }