diff --git a/core/service.go b/core/service.go
index 047f562..c6109dc 100644
--- a/core/service.go
+++ b/core/service.go
@@ -255,7 +255,12 @@ func (sh *serviceDescription) prepare(mg *Maingate) error {
 	sh.getUserTokenWithCheck = mg.getUserTokenWithCheck
 	sh.updateUserinfo = mg.updateUserinfo
 	sh.getProviderInfo = mg.getProviderInfo
+
+	if sh.Admins == nil {
+		sh.Admins = []string{}
+	}
 	sh.admins = unsafe.Pointer(&sh.Admins)
+
 	sh.wl = &mg.wl
 	bt, _ := json.Marshal(sh)
 	atomic.StorePointer(&sh.serviceSerialized, unsafe.Pointer(&bt))