diff --git a/core/ormstopwatch.class.inc.php b/core/ormstopwatch.class.inc.php
index eb74f4dc5..44d4f4402 100644
--- a/core/ormstopwatch.class.inc.php
+++ b/core/ormstopwatch.class.inc.php
@@ -259,6 +259,7 @@ class ormStopWatch
 	{
 		$this->iTimeSpent = 0;
 		$this->iStopped = null;
+		$this->iStarted = null;
 
 		foreach ($this->aThresholds as $iPercent => &$aThresholdData)
 		{