diff --git a/htdocs/projet/activity/perweek.php b/htdocs/projet/activity/perweek.php
index f3279d7300b..5fb7aeaf9e7 100644
--- a/htdocs/projet/activity/perweek.php
+++ b/htdocs/projet/activity/perweek.php
@@ -308,7 +308,7 @@ if ($action == 'addtime' && $user->hasRight('projet', 'lire') && GETPOST('formfi
 				}
 			}
 
-			if (!$updateoftaskdone) {  // Check to update progress if no update were done on task.
+			if (!$updateoftaskdone && GETPOSTISSET($taskid.'progress')) {  // Check to update progress if no update were done on task.
 				$object->fetch($tmptaskid);
 				//var_dump($object->progress);
 				//var_dump(GETPOST($tmptaskid . 'progress', 'int')); exit;