diff --git a/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php b/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
index c3945167370628df630b6d1bbd45cf3355b40cd6..54824de3cb5aaff2590afa02a5805b7350c8d16e 100644
--- a/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
+++ b/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
@@ -1960,7 +1960,7 @@ class ContentObjectRenderer implements LoggerAwareInterface
      */
     public function stdWrap_bytes($content = '', $conf = [])
     {
-        return GeneralUtility::formatSize((int)$content, $conf['bytes.']['labels'], $conf['bytes.']['base']);
+        return GeneralUtility::formatSize((int)$content, $conf['bytes.']['labels'] ?? '', $conf['bytes.']['base'] ?? 0);
     }
 
     /**
diff --git a/typo3/sysext/frontend/Tests/Unit/ContentObject/ContentObjectRendererTest.php b/typo3/sysext/frontend/Tests/Unit/ContentObject/ContentObjectRendererTest.php
index 52cdf14b94a272b51c9c2d32135268bb52e9520c..2d01fd4ef92d85639641931711a3b1683740ce62 100644
--- a/typo3/sysext/frontend/Tests/Unit/ContentObject/ContentObjectRendererTest.php
+++ b/typo3/sysext/frontend/Tests/Unit/ContentObject/ContentObjectRendererTest.php
@@ -3838,12 +3838,12 @@ class ContentObjectRendererTest extends UnitTestCase
      * - Almost all stdWrap_[type] are callable if called with 2 parameters:
      *   - string $content Empty string.
      *   - array $conf ['type' => '', 'type.' => []].
-     * - Exceptions: stdWrap_numRows, stdWrap_split
+     * - Exceptions: stdWrap_numRows
      * - The overall count is 91.
      *
      *  Note:
      *
-     *  The two exceptions break, if the configuration is empty. This test just
+     *  The exceptions break, if the configuration is empty. This test just
      *  tracks the different behaviour to gain information. It doesn't mean
      *  that it is an issue.
      *
@@ -3857,7 +3857,7 @@ class ContentObjectRendererTest extends UnitTestCase
         $linkFactory->create(Argument::cetera())->willReturn(new LinkResult('', ''));
         GeneralUtility::addInstance(LinkFactory::class, $linkFactory->reveal());
 
-        $expectExceptions = ['numRows', 'bytes'];
+        $expectExceptions = ['numRows'];
         $count = 0;
         $processors = [];
         $exceptions = [];
@@ -4276,6 +4276,16 @@ class ContentObjectRendererTest extends UnitTestCase
                 '1234567890',
                 ['labels' => '', 'base' => 0],
             ],
+            'value 1234 iec no base' => [
+                '1.21 Ki',
+                '1234',
+                ['labels' => 'iec'],
+            ],
+            'value 1234 no labels base set' => [
+                '1.21 Ki',
+                '1234',
+                ['base' => 0],
+            ],
         ];
     }