diff --git a/module/task/model.php b/module/task/model.php
index cdbb008a2e..1b7d064e60 100755
--- a/module/task/model.php
+++ b/module/task/model.php
@@ -1805,10 +1805,23 @@ class taskModel extends model
 
         /* Fix bug#3036. */
         foreach($record->consumed as $id => $item) $record->consumed[$id] = trim($item);
-        foreach($record->left     as $id => $item) $record->left[$id]     = trim($item);
-        foreach($record->consumed as $id => $item) if(!is_numeric($item) and !empty($item)) dao::$errors[] = 'ID #' . $id . ' ' . $this->lang->task->error->totalNumber;
-        foreach($record->left     as $id => $item) if(!is_numeric($item) and !empty($item)) dao::$errors[] = 'ID #' . $id . ' ' . $this->lang->task->error->leftNumber;
-        foreach($record->dates    as $id => $item) if($item > $today) dao::$errors[] = 'ID #' . $id . ' ' . $this->lang->task->error->date;
+        foreach($record->consumed as $id => $item)
+        {
+            if(!is_numeric($item) and !empty($item))
+            {
+                dao::$errors[] = 'ID #' . $id . ' ' . $this->lang->task->error->totalNumber;
+            }
+            elseif(is_numeric($item) and $item <= 0)
+            {
+                dao::$errors[] = sprintf($this->lang->error->gt, 'ID #' . $id . ' ' . $this->lang->task->record, '0');
+            }
+        }
+        foreach($record->left as $id => $item)
+        {
+            $record->left[$id] = trim($item);
+            if(!is_numeric($item) and !empty($item)) dao::$errors[] = 'ID #' . $id . ' ' . $this->lang->task->error->leftNumber;
+        }
+        foreach($record->dates as $id => $item) if($item > $today) dao::$errors[] = 'ID #' . $id . ' ' . $this->lang->task->error->date;
         if(dao::isError()) return false;
 
         $estimates    = array();