From 6766e459f21ae408090d83957ae02940e54ac7a6 Mon Sep 17 00:00:00 2001
From: Bill Xi <86190295+BillyLikesHacking@users.noreply.github.com>
Date: Sun, 31 Oct 2021 20:03:04 +0800
Subject: [PATCH] Update vectorized_mobject.py

---
 manimlib/mobject/types/vectorized_mobject.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/manimlib/mobject/types/vectorized_mobject.py b/manimlib/mobject/types/vectorized_mobject.py
index d4cf19ca..0e930084 100644
--- a/manimlib/mobject/types/vectorized_mobject.py
+++ b/manimlib/mobject/types/vectorized_mobject.py
@@ -991,6 +991,7 @@ class VGroup(VMobject):
         self.add(*vmobjects)
     
     def __add__(self:'VGroup', other : 'VMobject' or 'VGroup'):
+        assert(isinstance(other, VMobject))
         return self.add(other)