日志修改

Mall.Common/Plugin/WeiXinHelper.cs

@@ -58,7 +58,7 @@ namespace Mall.Common.Plugin
             {
                 //GetWeChatOpenId:result={"errcode":40163,"errmsg":"code been used, hints: [ req_id: AHGbGiqNe-OhJh.a ]"}&&Code=051S1Ykl2wYCF64U7gnl2AK6ga0S1Yk2
                 //Code过期
-                if (result != null && !result.Contains("40163"))
+                if (result != null && !string.IsNullOrEmpty(result) && !result.Contains("40163"))
                 {
                     Common.Plugin.LogHelper.Write(ex, string.Format("GetWeChatOpenId:result={0}&&Code={1}", result, Code));
                 }