diff --git a/adapter/outbound/wireguard.go b/adapter/outbound/wireguard.go
index eb48c0c0..33a0f44a 100644
--- a/adapter/outbound/wireguard.go
+++ b/adapter/outbound/wireguard.go
@@ -216,6 +216,9 @@ func (w *WireGuard) DialContext(ctx context.Context, metadata *C.Metadata, opts
 	if err != nil {
 		return nil, err
 	}
+	if conn == nil {
+		return nil, E.New("conn is nil")
+	}
 	return NewConn(&wgConn{conn, w}, w), nil
 }