app/Http/Controllers/Api/WxController.php

@@ -86,7 +86,7 @@ class WxController extends BaseController
         $tmpStr = sha1( $tmpStr );
 //        var_dump($tmpStr);
 //        var_dump($signature);die;
-        if( $tmpStr == $signature ){
+        if( $tmpStr == $signature && isset($data['echostr']) ){
             echo $data['echostr'];die;
         }else{
             die('fail');