diff --git a/System/Abstracts/Crontab.php b/System/Abstracts/Crontab.php
index 435cd31b..8fca60f4 100644
--- a/System/Abstracts/Crontab.php
+++ b/System/Abstracts/Crontab.php
@@ -38,7 +38,9 @@ class Crontab extends Component
 		$redis = Snowflake::app()->getRedis();
 
 		$data = $redis->zRevRange('system:crontab', 0, -1);
-
+		if (empty($data)) {
+			return;
+		}
 		foreach ($data as $datum) {
 			/** @var \Snowflake\Crontab $crontab */
 			$crontab = unserialize($datum);
@@ -57,7 +59,7 @@ class Crontab extends Component
 	{
 		$redis = Snowflake::app()->getRedis();
 
-		$redis->zRemRangeByRank('system:crontab', '0', '-1');
+		$redis->del('system:crontab');
 	}
 
 
diff --git a/System/Process/CrontabProcess.php b/System/Process/CrontabProcess.php
index d4e17de7..6fe14a2d 100644
--- a/System/Process/CrontabProcess.php
+++ b/System/Process/CrontabProcess.php
@@ -69,6 +69,11 @@ class CrontabProcess extends Process
 		$lists = $redis->zRangeByScore('system:crontab', '0', (string)$score);
 		$redis->zRemRangeByScore('system:crontab', '0', (string)$score);
 
+		if (empty($lists)) {
+			$redis->release();
+			return;
+		}
+
 		$barrier = Barrier::make();
 		foreach ($lists as $list) {
 			$list = unserialize($list);