diff --git a/htdocs/projet/class/project.class.php b/htdocs/projet/class/project.class.php
index 4413e9b3361..ebc887ccbb6 100644
--- a/htdocs/projet/class/project.class.php
+++ b/htdocs/projet/class/project.class.php
@@ -712,21 +712,22 @@ class Project extends CommonObject
     }
     
     /**
-     * 		Reoder tasks to delete children tasks first
+     * 		Delete tasks with no children first, then task with children recursively
      *  
-     *  	@param     array   $arr       Array of tasks
+     *  	@param     int		<0 if KO, 1 if OK
      */
     function deleteTasks($user)
     {
         $countTasks = count($this->lines);
         $deleted = false;
-        if ($countTasks){
+        if ($countTasks)
+	{
             foreach($this->lines as $task)
             {
-                if($task->hasChildren() <= 0) {
+                if ($task->hasChildren() <= 0) {		// If there is no children (or error to detect them)
                     $deleted = true;
                     $ret = $task->delete($user);
-                    if ($ret < 1)
+                    if ($ret <= 0)
                     {
                         $this->errors[] = $this->db->lasterror();
                         return -1;
@@ -735,7 +736,7 @@ class Project extends CommonObject
             }
         }
         $this->getLinesArray($user);
-        if($deleted && count($this->lines) < $countTasks)
+        if ($deleted && count($this->lines) < $countTasks)
         {
             if (count($this->lines)) $this->deleteTasks($this->lines);
         }