diff --git a/Classes/Utility/UrlUtility.php b/Classes/Utility/UrlUtility.php
index 84c49352..cd0c9746 100644
--- a/Classes/Utility/UrlUtility.php
+++ b/Classes/Utility/UrlUtility.php
@@ -25,7 +25,6 @@
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 
 use function array_merge;
-use function count;
 use function rtrim;
 use function strpos;
 
@@ -186,7 +185,9 @@ private function resolveWithVariants(
         array $variants = [],
         string $returnField = 'frontendBase'
     ): string {
-        if (count($variants) === 0) {
+        $frontendUrl = rtrim($frontendUrl, '/');
+
+        if ($variants === []) {
             return $frontendUrl;
         }
 
diff --git a/Classes/ViewHelpers/Format/Json/DecodeViewHelper.php b/Classes/ViewHelpers/Format/Json/DecodeViewHelper.php
index c6b253f5..f3e85eaa 100644
--- a/Classes/ViewHelpers/Format/Json/DecodeViewHelper.php
+++ b/Classes/ViewHelpers/Format/Json/DecodeViewHelper.php
@@ -33,6 +33,9 @@ public function render()
         $json = $this->arguments['json'];
         if ($json === null) {
             $json = $this->renderChildren();
+            if ($json !== null) {
+                $json = trim($json);
+            }
             if (empty($json)) {
                 return null;
             }
diff --git a/Tests/Unit/Utility/UrlUtilityTest.php b/Tests/Unit/Utility/UrlUtilityTest.php
index 6f6fcf54..4706e0d8 100644
--- a/Tests/Unit/Utility/UrlUtilityTest.php
+++ b/Tests/Unit/Utility/UrlUtilityTest.php
@@ -110,11 +110,11 @@ public function testFrontendUrlsWithBaseProductionAndLocalOverride(): void
     {
         $site = $this->prophesize(Site::class);
         $site->getConfiguration()->shouldBeCalled(3)->willReturn([
-            'base' => 'https://api.typo3.org',
-            'frontendBase' => 'https://www.typo3.org',
-            'frontendApiProxy' => 'https://www.typo3.org/headless',
-            'frontendFileApi' => 'https://www.typo3.org/headless/fileadmin',
-            'SpecialSitemapKey' => 'https://www.typo3.org/custom-sitemap',
+            'base' => 'https://api.typo3.org/',
+            'frontendBase' => 'https://www.typo3.org/',
+            'frontendApiProxy' => 'https://www.typo3.org/headless/',
+            'frontendFileApi' => 'https://www.typo3.org/headless/fileadmin/',
+            'SpecialSitemapKey' => 'https://www.typo3.org/custom-sitemap/',
             'languages' => [],
             'baseVariants' => [
                 [
@@ -672,7 +672,7 @@ public function testEdgeCases()
 
         $urlUtility = new UrlUtility(null, $resolver->reveal(), $siteFinder, $request->reveal());
         self::assertSame('https://frontend-domain-from-lang.tld', $urlUtility->getFrontendUrl());
-        self::assertSame('https://frontend-domain-from-lang.tld/headless/', $urlUtility->getProxyUrl());
+        self::assertSame('https://frontend-domain-from-lang.tld/headless', $urlUtility->getProxyUrl());
         self::assertSame('https://frontend-domain-from-lang.tld/headless/fileadmin', $urlUtility->getStorageProxyUrl());
 
         // configuration on language lvl with variants
diff --git a/Tests/Unit/ViewHelpers/Format/Json/DecodeViewHelperTest.php b/Tests/Unit/ViewHelpers/Format/Json/DecodeViewHelperTest.php
new file mode 100644
index 00000000..2579731a
--- /dev/null
+++ b/Tests/Unit/ViewHelpers/Format/Json/DecodeViewHelperTest.php
@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of the "headless" Extension for TYPO3 CMS.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.md file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace FriendsOfTYPO3\Headless\Tests\Unit\ViewHelpers\Format\Json;
+
+use FriendsOfTYPO3\Headless\ViewHelpers\Format\Json\DecodeViewHelper;
+use TYPO3\TestingFramework\Core\Unit\UnitTestCase;
+
+class DecodeViewHelperTest extends UnitTestCase
+{
+    public function testRender(): void
+    {
+        $GLOBALS['TYPO3_CONF_VARS']['FE']['debug'] = true;
+        $decodeViewHelper = new DecodeViewHelper();
+        $decodeViewHelper->setArguments(['json' => null]);
+        $decodeViewHelper->setRenderChildrenClosure(function () { return "\n \n"; });
+        $result = $decodeViewHelper->render();
+        self::assertNull($result);
+    }
+}