diff --git a/Build/phpstan.neon b/Build/phpstan.neon
index 00e823e0c..ed5e6286b 100644
--- a/Build/phpstan.neon
+++ b/Build/phpstan.neon
@@ -12,7 +12,6 @@ parameters:
 	ignoreErrors:
 		- identifier: missingType.iterableValue
 		- "#Casting to string something that's already string.#"
-		- "#^Call to an undefined method TYPO3Fluid\\\\Fluid\\\\Core\\\\Rendering\\\\RenderingContextInterface\\:\\:getRequest\\(\\)\\.$#"
 
 	paths:
 	- %currentWorkingDirectory%/Classes/
diff --git a/Classes/ViewHelpers/TypoScript/ConstantViewHelper.php b/Classes/ViewHelpers/TypoScript/ConstantViewHelper.php
index 605b5d73a..2ea0a9ba5 100644
--- a/Classes/ViewHelpers/TypoScript/ConstantViewHelper.php
+++ b/Classes/ViewHelpers/TypoScript/ConstantViewHelper.php
@@ -11,10 +11,13 @@
 namespace BK2K\BootstrapPackage\ViewHelpers\TypoScript;
 
 use BK2K\BootstrapPackage\Utility\TypoScriptUtility;
+use TYPO3\CMS\Fluid\Core\Rendering\RenderingContext;
 use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper;
 
 /**
  * ConstantViewHelper
+ *
+ * {bk2k:typoScript.constant(constant: 'identifier')}
  */
 class ConstantViewHelper extends AbstractViewHelper
 {
@@ -31,7 +34,15 @@ public function initializeArguments(): void
 
     public function render(): string
     {
-        $constant = $this->arguments['constant'] ?? '';
-        return TypoScriptUtility::getConstants($this->renderingContext->getRequest())[$constant] ?? '';
+        $renderingContext = $this->renderingContext;
+        if ($renderingContext instanceof RenderingContext && $renderingContext->getRequest() !== null) {
+            $constant = $this->arguments['constant'] ?? '';
+            return TypoScriptUtility::getConstants($renderingContext->getRequest())[$constant] ?? '';
+        }
+
+        throw new \RuntimeException(
+            'ViewHelper bk2k:typoScript.constant needs a request implementing ServerRequestInterface.',
+            1639819269
+        );
     }
 }