fix bug

app/Http/Controllers/Wap/Web/RedirectController.php

@@ -48,7 +48,7 @@ class RedirectController extends Controller
         $query_param = $request->except('_url');
         $query_param['soid'] = $param;
         //判断是否强制到服务号阅读
-        if($link->force_show_qrcode)
+        if($link && $link->force_show_qrcode)
         {
             Cookie::queue('force_show_qrcode', 1, 1);
         }else{