From acdc2654d350a4e88f05d4cff98e519c729f1829 Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Thu, 26 Jan 2023 16:52:25 -0800
Subject: [PATCH] Account for 'target_mobject is None' case

---
 manimlib/animation/transform.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/manimlib/animation/transform.py b/manimlib/animation/transform.py
index 62fd87a7..012bfad9 100644
--- a/manimlib/animation/transform.py
+++ b/manimlib/animation/transform.py
@@ -70,7 +70,8 @@ class Transform(Animation):
     def finish(self) -> None:
         super().finish()
         self.mobject.unlock_data()
-        self.mobject.become(self.target_mobject)
+        if self.target_mobject is not None:
+            self.mobject.become(self.target_mobject)
 
     def create_target(self) -> Mobject:
         # Has no meaningful effect here, but may be useful