diff --git a/eventhandler/projector/eventhandler.go b/eventhandler/projector/eventhandler.go
index 792bfe92..8c9907b2 100644
--- a/eventhandler/projector/eventhandler.go
+++ b/eventhandler/projector/eventhandler.go
@@ -124,6 +124,11 @@ func (h *EventHandler) HandleEvent(ctx context.Context, event eh.Event) error {
 
 	// The entity should be one version behind the event.
 	if entity, ok := entity.(eh.Versionable); ok {
+		// Ignore old/duplicate events.
+		if entity.AggregateVersion() >= event.Version() {
+			return nil
+		}
+
 		if entity.AggregateVersion()+1 != event.Version() {
 			return Error{
 				Err:       eh.ErrIncorrectEntityVersion,
diff --git a/eventhandler/projector/eventhandler_test.go b/eventhandler/projector/eventhandler_test.go
index 1a07528c..d30e8889 100644
--- a/eventhandler/projector/eventhandler_test.go
+++ b/eventhandler/projector/eventhandler_test.go
@@ -99,6 +99,11 @@ func TestEventHandler_UpdateModel(t *testing.T) {
 	if repo.Entity != projector.newEntity {
 		t.Error("the new entity should be correct:", repo.Entity)
 	}
+
+	// Handle event again, should be a no-op.
+	if err := handler.HandleEvent(ctx, event); err != nil {
+		t.Error("there shoud be no error:", err)
+	}
 }
 
 func TestEventHandler_UpdateModelWithVersion(t *testing.T) {
@@ -137,6 +142,11 @@ func TestEventHandler_UpdateModelWithVersion(t *testing.T) {
 	if repo.Entity != projector.newEntity {
 		t.Error("the new entity should be correct:", repo.Entity)
 	}
+
+	// Handle event again, should be a no-op.
+	if err := handler.HandleEvent(ctx, event); err != nil {
+		t.Error("there shoud be no error:", err)
+	}
 }
 
 func TestEventHandler_UpdateModelWithEventsOutOfOrder(t *testing.T) {