From cc355dad785720a09ba94795aae9a909d0d40544 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mr=C2=B7x?= <as2252258@163.com>
Date: Mon, 7 Sep 2020 16:55:46 +0800
Subject: [PATCH] =?UTF-8?q?=E6=94=B9=E5=90=8D?=
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---
 System/Error/Logger.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/System/Error/Logger.php b/System/Error/Logger.php
index 7d3ba121..ed6f04b9 100644
--- a/System/Error/Logger.php
+++ b/System/Error/Logger.php
@@ -112,7 +112,7 @@ class Logger extends Component
 	{
 		$debug = (bool)Config::get('debug', false, ['enable' => false]);
 		if ($debug['enable'] === true) {
-			if (!is_callable($debug['callback'], true)) {
+			if (!is_callable($debug['callback'] ?? null, true)) {
 				return;
 			}
 			call_user_func($debug['callback'], $message, $category);