diff --git a/lib/feishuapi/feishuapi.class.php b/lib/feishuapi/feishuapi.class.php
index e295dd12ea..89c84a3150 100644
--- a/lib/feishuapi/feishuapi.class.php
+++ b/lib/feishuapi/feishuapi.class.php
@@ -265,7 +265,7 @@ class feishuapi
             curl_setopt($ch, CURLOPT_URL, $url);
             curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
             curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
-            if($_SERVER['HTTPS'] != 'on')
+            if(!isset($_SERVER['HTTPS']) or $_SERVER['HTTPS'] != 'on')
             {
                 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
                 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);