diff --git a/zmsdb/src/Zmsdb/Helper/ArchivedDataIntoStatisticByCron.php b/zmsdb/src/Zmsdb/Helper/ArchivedDataIntoStatisticByCron.php
index 68209d52d..fe48db9f6 100644
--- a/zmsdb/src/Zmsdb/Helper/ArchivedDataIntoStatisticByCron.php
+++ b/zmsdb/src/Zmsdb/Helper/ArchivedDataIntoStatisticByCron.php
@@ -89,7 +89,7 @@ protected function writeProcessInStatisticTable(
     ) {
         $requestList = (new \BO\Zmsdb\Request())->readRequestByArchiveId($process->archiveId);
         $requestList = ($requestList->count()) ? $requestList : [new \BO\Zmsentities\Request(['id' => '-1'])];
-        $processingTime = $requestList->count() === 1 ? $process->bearbeitungszeit : null;
+        $processingTime = ($requestList->count() && $requestList->count() === 1) ? $process->bearbeitungszeit : null;
 
         foreach ($requestList as $request) {
             $archived = true; // for verbose