fix

zhongzheng-framework/src/main/java/com/zhongzheng/framework/web/service/WxLoginService.java

@@ -1297,7 +1297,7 @@ public class WxLoginService implements IWxLoginService {
         }
         if (Validator.isEmpty(seller.getGzhOpenId())) {
             seller.setGzhOpenId(openId);
-            if (unionId.equals("null")) {
+            if(Validator.isNotEmpty(unionId)&&!unionId.equals("null")){
                 seller.setUnionId(unionId);
             }
             iDistributionSellerService.updateById(seller);