diff --git a/Classes/Common/AbstractDocument.php b/Classes/Common/AbstractDocument.php
index 9620c4799..0f3d280f6 100644
--- a/Classes/Common/AbstractDocument.php
+++ b/Classes/Common/AbstractDocument.php
@@ -574,7 +574,7 @@ public static function &getInstance(string $location, array $settings = [], bool
         }
 
         // Sanitize input.
-        $pid = max((int) $settings['storagePid'], 0);
+        $pid = $settings['storagePid'] ? max((int) $settings['storagePid'], 0) : 0;
         if ($documentFormat == 'METS') {
             $instance = new MetsDocument($pid, $location, $xml, $settings);
         } elseif ($documentFormat == 'IIIF') {