微信公众号关注，取关回调

nbjk-service/src/main/java/com/miaxis/wx/service/impl/WxGzhServiceImpl.java

@@ -165,7 +165,7 @@ public class WxGzhServiceImpl implements IWxGzhService {
                 }  else if (MessageUtil.MESSAGE_UNSUBSCRIBE.equals(event)) { // 取消订阅事件
                     log.info("3.2...");
                     UserInfo userInfoDB = userService.getStudentByOpenId(fromUserName);
-                    if (userInfoDB == null) {
+                    if (userInfoDB != null) {
                         userInfoDB.setGzhOpenid(null);
                         userService.updateStudent(userInfoDB);
                     }