diff --git a/neutrino-proxy-server/src/main/java/org/dromara/neutrinoproxy/server/controller/PortMappingController.java b/neutrino-proxy-server/src/main/java/org/dromara/neutrinoproxy/server/controller/PortMappingController.java
index 061f6d53..254c3bab 100644
--- a/neutrino-proxy-server/src/main/java/org/dromara/neutrinoproxy/server/controller/PortMappingController.java
+++ b/neutrino-proxy-server/src/main/java/org/dromara/neutrinoproxy/server/controller/PortMappingController.java
@@ -48,7 +48,7 @@ public class PortMappingController {
 		ParamCheckUtil.checkNotNull(networkProtocolEnum, ExceptionConstant.AN_UNSUPPORTED_PROTOCOL, req.getProtocal());
 		if (networkProtocolEnum != NetworkProtocolEnum.HTTP) {
 			// 目前仅HTTP支持绑定域名
-			req.setSubdomain("");
+			req.setSubdomain(null);
 		}
 
 		return portMappingService.create(req);
@@ -70,7 +70,7 @@ public class PortMappingController {
 		ParamCheckUtil.checkNotNull(networkProtocolEnum, ExceptionConstant.AN_UNSUPPORTED_PROTOCOL, req.getProtocal());
 		if (networkProtocolEnum != NetworkProtocolEnum.HTTP) {
 			// 目前仅HTTP支持绑定域名
-			req.setSubdomain("");
+			req.setSubdomain(null);
 		}
 
 		return portMappingService.update(req);
diff --git a/neutrino-proxy-server/src/main/java/org/dromara/neutrinoproxy/server/dal/PortMappingMapper.java b/neutrino-proxy-server/src/main/java/org/dromara/neutrinoproxy/server/dal/PortMappingMapper.java
index 40a4f89f..cf35a7c0 100644
--- a/neutrino-proxy-server/src/main/java/org/dromara/neutrinoproxy/server/dal/PortMappingMapper.java
+++ b/neutrino-proxy-server/src/main/java/org/dromara/neutrinoproxy/server/dal/PortMappingMapper.java
@@ -4,6 +4,7 @@ import cn.hutool.core.collection.CollectionUtil;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.baomidou.mybatisplus.core.toolkit.StringUtils;
 import org.dromara.neutrinoproxy.server.constant.EnableStatusEnum;
 import org.dromara.neutrinoproxy.server.controller.req.proxy.PortMappingListReq;
 import org.dromara.neutrinoproxy.server.dal.entity.PortMappingDO;
@@ -48,7 +49,7 @@ public interface PortMappingMapper extends BaseMapper<PortMappingDO> {
 	 * @return
 	 */
 	default Boolean checkRepeatBySubdomain(String subdomain, Set<Integer> excludeIds) {
-		return this.selectCount(new LambdaQueryWrapper<PortMappingDO>()
+		return StringUtils.isEmpty(subdomain)? Boolean.FALSE : this.selectCount(new LambdaQueryWrapper<PortMappingDO>()
 				.eq(PortMappingDO::getSubdomain, subdomain)
 				.notIn(!CollectionUtil.isEmpty(excludeIds), PortMappingDO::getId, excludeIds)
 		).intValue() > 0;