diff --git a/neutrino-proxy-server/src/main/java/fun/asgc/neutrino/proxy/server/service/LicenseService.java b/neutrino-proxy-server/src/main/java/fun/asgc/neutrino/proxy/server/service/LicenseService.java
index a744706c..4da7fe49 100644
--- a/neutrino-proxy-server/src/main/java/fun/asgc/neutrino/proxy/server/service/LicenseService.java
+++ b/neutrino-proxy-server/src/main/java/fun/asgc/neutrino/proxy/server/service/LicenseService.java
@@ -125,7 +125,7 @@ public class LicenseService {
 		ParamCheckUtil.checkNotNull(oldLicenseDO, ExceptionConstant.LICENSE_NOT_EXIST);
 
 		LicenseDO licenseCheck = licenseMapper.checkRepeat(oldLicenseDO.getUserId(), req.getName(), Sets.newHashSet(oldLicenseDO.getId()));
-		ParamCheckUtil.checkNotNull(licenseCheck, ExceptionConstant.LICENSE_NAME_CANNOT_REPEAT);
+		ParamCheckUtil.checkMustNull(licenseCheck, ExceptionConstant.LICENSE_NAME_CANNOT_REPEAT);
 
 		licenseMapper.update(req.getId(), req.getName(), new Date());
 		return new LicenseUpdateRes();
diff --git a/neutrino-proxy-server/src/main/java/fun/asgc/neutrino/proxy/server/util/ParamCheckUtil.java b/neutrino-proxy-server/src/main/java/fun/asgc/neutrino/proxy/server/util/ParamCheckUtil.java
index f1980e10..7dc59f49 100644
--- a/neutrino-proxy-server/src/main/java/fun/asgc/neutrino/proxy/server/util/ParamCheckUtil.java
+++ b/neutrino-proxy-server/src/main/java/fun/asgc/neutrino/proxy/server/util/ParamCheckUtil.java
@@ -66,6 +66,13 @@ public class ParamCheckUtil {
 		}
 	}
 
+	public static void checkMustNull(Object obj, ExceptionConstant constant, Object... params) {
+		if (null != obj) {
+			throw ServiceException.create(constant, params);
+		}
+	}
+
+
 	public static void checkNotNull(Object obj, ExceptionConstant constant, Object... params) {
 		if (null == obj) {
 			throw ServiceException.create(constant, params);