diff --git a/src/Integrations/Divi/Compose/ValueCleaner.php b/src/Integrations/Divi/Compose/ValueCleaner.php
index 99c6921..675daa3 100644
--- a/src/Integrations/Divi/Compose/ValueCleaner.php
+++ b/src/Integrations/Divi/Compose/ValueCleaner.php
@@ -181,14 +181,15 @@ final class ValueCleaner
             return;
         }
         // Divi reads enable and queryType through sanitize_key() (LoopUtils.php:725-731): stored values count so.
-        $key = static fn (mixed $value): string => is_string($value)
-            ? (string) preg_replace('/[^a-z0-9_\-]/', '', strtolower($value))
+        $key = static fn (mixed $value): string => is_scalar($value)
+            ? (string) preg_replace('/[^a-z0-9_\-]/', '', strtolower((string) $value))
             : '';
         if ($key($desktopValue['enable'] ?? null) !== 'on') {
             return;
         }
 
-        $queryType = array_key_exists('queryType', $desktopValue) ? $key($desktopValue['queryType']) : 'post_types';
+        // isset() like Divi: null falls back to post_types.
+        $queryType = isset($desktopValue['queryType']) ? $key($desktopValue['queryType']) : 'post_types';
         if (($queryType === 'user_roles' || $queryType === 'users') && ! $this->sanitizer->canListUsers()) {
             throw new InvalidArgumentException(
                 'Eine Benutzer-Schleife listet Konten und E-Mail-Adressen und braucht das Recht list_users; '
diff --git a/tests/Unit/Integrations/Divi/Compose/ValueCleanerTest.php b/tests/Unit/Integrations/Divi/Compose/ValueCleanerTest.php
index 2f0b855..886fd87 100644
--- a/tests/Unit/Integrations/Divi/Compose/ValueCleanerTest.php
+++ b/tests/Unit/Integrations/Divi/Compose/ValueCleanerTest.php
@@ -40,6 +40,8 @@ final class ValueCleanerTest extends TestCase
             'attachment among others' => [$post + ['subTypes' => $types('post', 'attachment')]],
             'only unknown types (Divi falls back to any)' => [$post + ['subTypes' => $types('gibtesnicht')]],
             'comma string with any' => [$post + ['subTypes' => 'post, ANY']],
+            'queryType null (isset: post_types), no subTypes' => [['enable' => 'on', 'queryType' => null]],
+            'subTypes null' => [$post + ['subTypes' => null]],
             'entries without value' => [$post + ['subTypes' => [['label' => 'x']]]],
         ];
     }