diff --git a/src/Services/Everhour.php b/src/Services/Everhour.php
index 726aecfe..f1fd1c6e 100644
--- a/src/Services/Everhour.php
+++ b/src/Services/Everhour.php
@@ -151,7 +151,7 @@ protected function convertToPastTimers($everhourTimers)
     protected function buildPastTimerObject($everhourTimer, $projects)
     {
         $pastTimer['id'] = $everhourTimer->id;
-        $pastTimer['description'] = $everhourTimer->comment ?? null;
+        $pastTimer['description'] = $everhourTimer->comment ?? '';
 
         if (isset($everhourTimer->task)) {
             $pastTimer['project_id'] = $everhourTimer->task->projects[0];