diff --git a/server/app/common/lists/BaseDataLists.php b/server/app/common/lists/BaseDataLists.php
index bebf81c2e7e01a37b491fc3057a0bff75a328f7a..b7521fe12e293fa1c928b5522b0c0e38958b69f9 100644
--- a/server/app/common/lists/BaseDataLists.php
+++ b/server/app/common/lists/BaseDataLists.php
@@ -119,9 +119,9 @@ abstract class BaseDataLists implements ListsInterface
         if (!($this instanceof ListsSearchInterface)) {
             return [];
         }
-        $startTime = $this->request->get('start_time');
+        $startTime = $this->request->get('start_time')??0;
         $this->startTime = strtotime($startTime);
-        $endTime = $this->request->get('end_time');
+        $endTime = $this->request->get('end_time')??0;
         $this->endTime = strtotime($endTime);
 
         $this->start = $this->request->get('start');