diff --git a/pkg/cloudmon/resources/resources.go b/pkg/cloudmon/resources/resources.go
index 4b3d69f39f..8ad8f23f7a 100644
--- a/pkg/cloudmon/resources/resources.go
+++ b/pkg/cloudmon/resources/resources.go
@@ -737,6 +737,11 @@ func (self *SResources) CollectMetrics(ctx context.Context, userCred mcclient.To
 			}
 			for t := range servers {
 				tags := projectTags.GetTags(servers[t].ProjectId)
+				if servers[t].Metadata == nil {
+					server := servers[t]
+					server.Metadata = map[string]string{}
+					servers[t] = server
+				}
 				for k, v := range tags {
 					if strings.HasPrefix(k, db.USER_TAG_PREFIX) {
 						servers[t].Metadata[k] = v