diff --git a/pkg/actor/mutation_registry.go b/pkg/actor/mutation_registry.go
index 9fdfa88..37130bf 100644
--- a/pkg/actor/mutation_registry.go
+++ b/pkg/actor/mutation_registry.go
@@ -153,15 +153,14 @@ func (r *ProtoMutationRegistry) Apply(grain any, msg ...proto.Message) error {
 		return fmt.Errorf("nil mutation message")
 	}
 
-	rt := indirectType(reflect.TypeOf(msg))
-	r.mutationRegistryMu.RLock()
-	entry, ok := r.mutationRegistry[rt]
-	r.mutationRegistryMu.RUnlock()
-
-	if !ok {
-		return ErrMutationNotRegistered
-	}
 	for _, m := range msg {
+		rt := indirectType(reflect.TypeOf(msg))
+		r.mutationRegistryMu.RLock()
+		entry, ok := r.mutationRegistry[rt]
+		r.mutationRegistryMu.RUnlock()
+		if !ok {
+			return ErrMutationNotRegistered
+		}
 		if err := entry.Handle(grain, m); err != nil {
 			return err
 		}