diff --git a/module/my/view/task.html.php b/module/my/view/task.html.php
index 6b5823abca..4970f9c063 100644
--- a/module/my/view/task.html.php
+++ b/module/my/view/task.html.php
@@ -152,6 +152,7 @@
   </form>
   <?php endif;?>
 </div>
+<?php js::set('tasks', $tasks);?>
 <script>
 $(function()
 {
@@ -184,30 +185,12 @@ $(function()
                 }
                 var data = $row.data();
                 taskIdList.push(data.id);
-
                 var status = data.status;
                 if(status === 'wait') checkedWait++;
                 if(status === 'doing') checkedDoing++;
 
-                var canStatistics = false;
-                if(!$row.hasClass('table-children'))
-                {
-                    canStatistics = true;
-                }
-                else
-                {
-                    /* Fix bug #2579. When only child task is checked then statistics it. */
-                    var parentID = 0;
-                    var classes  = $row.attr('class').split(' ');
-                    for(i in classes)
-                    {
-                        if(classes[i].indexOf('parent-') >= 0) parentID = classes[i].replace('parent-', '');
-                    }
-
-                    if(parentID && taskIdList.indexOf(parseInt(parentID)) < 0) canStatistics = true;
-                }
-
-                if(canStatistics)
+                var parentID = tasks[$row.data('id')].parent;
+                if(parentID <= 0 || !$('tbody>tr[data-id="' + parentID  + '"]').length > 0)
                 {
                     checkedEstimate += Number(data.estimate);
                     checkedConsumed += Number(data.consumed);
diff --git a/module/project/model.php b/module/project/model.php
index 00266a0896..0b1343fc73 100644
--- a/module/project/model.php
+++ b/module/project/model.php
@@ -2736,10 +2736,13 @@ class projectModel extends model
 
         foreach($tasks as $task)
         {
-            $totalEstimate  += $task->estimate;
-            $totalConsumed  += $task->consumed;
+            if(!isset($tasks[$task->parent]) or $task->parent <= 0)
+            {
+                $totalEstimate  += $task->estimate;
+                $totalConsumed  += $task->consumed;
 
-            if($task->status != 'cancel' and $task->status != 'closed') $totalLeft += $task->left;
+                if($task->status != 'cancel' and $task->status != 'closed') $totalLeft += $task->left;
+            }
 
             $statusVar = 'status' . ucfirst($task->status);
             $$statusVar ++;