diff --git a/neutrino-proxy-server/src/main/java/fun/asgc/neutrino/proxy/server/service/PortPoolService.java b/neutrino-proxy-server/src/main/java/fun/asgc/neutrino/proxy/server/service/PortPoolService.java
index 5fef3d10..39db97ba 100644
--- a/neutrino-proxy-server/src/main/java/fun/asgc/neutrino/proxy/server/service/PortPoolService.java
+++ b/neutrino-proxy-server/src/main/java/fun/asgc/neutrino/proxy/server/service/PortPoolService.java
@@ -65,7 +65,7 @@ public class PortPoolService {
 
 	public PortPoolCreateRes create(PortPoolCreateReq req) {
 		PortPoolDO oldPortPoolDO = portPoolMapper.findByPort(req.getPort());
-		ParamCheckUtil.checkNotNull(oldPortPoolDO, ExceptionConstant.PORT_CANNOT_REPEAT);
+		ParamCheckUtil.checkMustNull(oldPortPoolDO, ExceptionConstant.PORT_CANNOT_REPEAT);
 
 		Date now = new Date();