diff --git a/wshandler/wshandler.go b/wshandler/wshandler.go
index f6c9a7f..fa2a5d2 100644
--- a/wshandler/wshandler.go
+++ b/wshandler/wshandler.go
@@ -133,6 +133,7 @@ func init() {
 	gob.Register(map[string]any{})
 	gob.Register(primitive.A{})
 	gob.Register(primitive.M{})
+	gob.Register(primitive.D{})
 	gob.Register(primitive.ObjectID{})
 	gob.Register([]any{})
 }