diff --git a/adapter/outboundgroup/loadbalance.go b/adapter/outboundgroup/loadbalance.go
index f0342c56..198bf60d 100644
--- a/adapter/outboundgroup/loadbalance.go
+++ b/adapter/outboundgroup/loadbalance.go
@@ -36,6 +36,10 @@ func parseStrategy(config map[string]any) string {
 }
 
 func getKey(metadata *C.Metadata) string {
+	if metadata == nil {
+		return ""
+	}
+
 	if metadata.Host != "" {
 		// ip host
 		if ip := net.ParseIP(metadata.Host); ip != nil {