diff --git a/function.php b/function.php
index ef7eeb3a..80aa8a22 100644
--- a/function.php
+++ b/function.php
@@ -326,9 +326,6 @@ if (!function_exists('isUrl')) {
 		if (!empty($query)) $path .= '?' . $query;
 		if (!empty($fragment)) $path .= '#' . $fragment;
 
-
-		unset($outPut);
-
 		return [$scheme == 'https', $host, $port, $path];
 	}
 
diff --git a/kiri-engine/Context.php b/kiri-engine/Context.php
index 84a80f35..df524598 100644
--- a/kiri-engine/Context.php
+++ b/kiri-engine/Context.php
@@ -134,9 +134,9 @@ class Context extends BaseContext
 			return;
 		}
 		if (Coroutine::getCid() === -1) {
-			unset(static::$_contents[$id]);
+			static::$_contents[$id] = null;
 		} else {
-			unset(Coroutine::getContext($coroutineId)[$id]);
+			Coroutine::getContext($coroutineId)[$id] = null;
 		}
 	}