diff --git a/application/TimerecordingEmployee/TimerecordingEmployeeController.php b/application/TimerecordingEmployee/TimerecordingEmployeeController.php
index f3a2fa271..3eae25209 100644
--- a/application/TimerecordingEmployee/TimerecordingEmployeeController.php
+++ b/application/TimerecordingEmployee/TimerecordingEmployeeController.php
@@ -284,7 +284,7 @@ class TimerecordingEmployeeController extends mfBaseController
         foreach ($TimerecordingEmployeeWorkingHourHistory as $key => $value) {
             $workinghours = json_decode($value->workinghours, true);
             $datetimetext = "";
-            $secondcounter = "";
+            $secondcounter = 0;
             foreach ($workinghours as $key2 => $data) {
                 $secondcounter = $secondcounter + strtotime(date("Y-m-d " . $data['end'] . ":00")) - strtotime(date("Y-m-d " . $data['start'] . ":00"));
                 $datetimetext .= $days_short[$data['day']] . " " . $data['start'] . " - " . $data['end'] . "<br>";