diff --git a/typo3/sysext/rte_ckeditor/Classes/Controller/BrowseLinksController.php b/typo3/sysext/rte_ckeditor/Classes/Controller/BrowseLinksController.php
index 860a2bed6dd11ba248799e8a5e1230b9e207b641..a7ef489f2fdb8f92a927f0b4d5ec435a841eeda0 100644
--- a/typo3/sysext/rte_ckeditor/Classes/Controller/BrowseLinksController.php
+++ b/typo3/sysext/rte_ckeditor/Classes/Controller/BrowseLinksController.php
@@ -99,8 +99,8 @@ class BrowseLinksController extends AbstractLinkBrowserController
         $queryParameters = $request->getQueryParams();
         $this->siteUrl = $request->getAttribute('normalizedParams')->getSiteUrl();
         $this->currentLinkParts = $queryParameters['P']['curUrl'] ?? [];
-        $this->editorId = $queryParameters['editorId'];
-        $this->contentsLanguage = $queryParameters['contentsLanguage'];
+        $this->editorId = $queryParameters['editorId'] ?? '';
+        $this->contentsLanguage = $queryParameters['contentsLanguage'] ?? '';
         $this->contentLanguageService = $this->languageServiceFactory->create($this->contentsLanguage);
         $tcaFieldConf = [
             'enableRichtext' => true,