diff --git a/htdocs/projet/tasks/time.php b/htdocs/projet/tasks/time.php
index 3844d8eeb50..f3271535bcd 100644
--- a/htdocs/projet/tasks/time.php
+++ b/htdocs/projet/tasks/time.php
@@ -160,7 +160,7 @@ if ($action == 'addtimespent' && $user->rights->projet->lire)
 			$object->timespent_note = $_POST["timespent_note"];
 			$object->progress = GETPOST('progress', 'int');
 			$object->timespent_duration = $_POST["timespent_durationhour"]*60*60;	// We store duration in seconds
-			$object->timespent_duration+= $_POST["timespent_durationmin"]*60;		// We store duration in seconds
+			$object->timespent_duration+= ($_POST["timespent_durationmin"]?$_POST["timespent_durationmin"]:0)*60;   // We store duration in seconds
 	        if (GETPOST("timehour") != '' && GETPOST("timehour") >= 0)	// If hour was entered
 	        {
 				$object->timespent_date = dol_mktime(GETPOST("timehour"),GETPOST("timemin"),0,GETPOST("timemonth"),GETPOST("timeday"),GETPOST("timeyear"));