diff --git a/mailpoet/lib/PostEditorBlocks/WooCommerceBlocksIntegration.php b/mailpoet/lib/PostEditorBlocks/WooCommerceBlocksIntegration.php
index 44354bf24d..86398288b5 100644
--- a/mailpoet/lib/PostEditorBlocks/WooCommerceBlocksIntegration.php
+++ b/mailpoet/lib/PostEditorBlocks/WooCommerceBlocksIntegration.php
@@ -120,7 +120,7 @@ class WooCommerceBlocksIntegration {
           return [
             'optin' => [
               'description' => __('Subscribe to marketing opt-in.', 'mailpoet'),
-              'type' => 'boolean',
+              'type' => ['boolean', 'null'],
             ],
           ];
         },