diff --git a/upload/source/class/class_task.php b/upload/source/class/class_task.php
index d25b59aa9c58c01d11927dce168094a416dadaea..c69e70f74eb38b6c3e4abf387d1e97801161cea7 100644
--- a/upload/source/class/class_task.php
+++ b/upload/source/class/class_task.php
@@ -395,7 +395,7 @@ class task {
 
 		if($result === TRUE) {
 
-			if($this->task['reward']) {
+			if($this->task['reward'] && C::t('common_mytask')->update_to_success($_G['uid'], $id, $_G['timestamp']) && C::t('common_task')->update_achievers($id, 1)) {
 				$rewards = $this->reward();
 				$notification = $this->task['reward'];
 				if($this->task['reward'] == 'magic') {
@@ -427,9 +427,6 @@ class task {
 				$taskclass->sufprocess($this->task);
 			}
 
-			C::t('common_mytask')->update($_G['uid'], $id, array('status' => 1, 'csc' => 100, 'dateline' => $_G['timestamp']));
-			C::t('common_task')->update_achievers($id, 1);
-
 			if($_G['inajax']) {
 				$this->message('100', $this->task['reward'] ? 'task_reward_'.$this->task['reward'] : 'task_completed', array(
 						'creditbonus' => $_G['setting']['extcredits'][$this->task['prize']]['title'].' '.$this->task['bonus'].' '.$_G['setting']['extcredits'][$this->task['prize']]['unit'],
diff --git a/upload/source/class/table/table_common_mytask.php b/upload/source/class/table/table_common_mytask.php
index 0020d17af2328d0dafa7eded37c5df73bd100675..ab82d6af021d134c4cc61ea72559a511e6ce2d35 100644
--- a/upload/source/class/table/table_common_mytask.php
+++ b/upload/source/class/table/table_common_mytask.php
@@ -64,6 +64,10 @@ class table_common_mytask extends discuz_table
 		return DB::fetch_first("SELECT * FROM %t WHERE uid=%d AND taskid=%d", array($this->_table, $uid, $taskid));
 	}
 
+	public function update_to_success($uid, $taskid, $timestamp) {
+		return DB::query('UPDATE '.DB::table($this->_table)." SET status = '1', csc = '100', dateline = '".intval($timestamp)."' WHERE taskid = '".intval($taskid)."' AND uid = '".intval($uid)."' AND status != '1'");
+	}
+
 }
 
 ?>
\ No newline at end of file
diff --git a/upload/source/class/table/table_common_task.php b/upload/source/class/table/table_common_task.php
index 4788cb2012d6bb312875f91838a6cbe464f3c9ae..264887727bc3b38830949e491dde01f0170bddad 100644
--- a/upload/source/class/table/table_common_task.php
+++ b/upload/source/class/table/table_common_task.php
@@ -49,7 +49,7 @@ class table_common_task extends discuz_table
 	}
 
 	public function update_achievers($taskid, $v) {
-		DB::query("UPDATE %t SET achievers=achievers+%s WHERE taskid=%d", array($this->_table, $v, $taskid));
+		return DB::query("UPDATE %t SET achievers=achievers+%s WHERE taskid=%d", array($this->_table, $v, $taskid));
 	}
 
 	public function update_available() {