From d6f40c2e453f3c07807fef7926a31717f180b660 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Tue, 11 Feb 2025 14:06:48 -0500
Subject: [PATCH] Make _add_method fail gracefully

---
 Lib/fontTools/subset/util.py | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/Lib/fontTools/subset/util.py b/Lib/fontTools/subset/util.py
index d20e925d7..7be1a22de 100644
--- a/Lib/fontTools/subset/util.py
+++ b/Lib/fontTools/subset/util.py
@@ -12,10 +12,8 @@ def _add_method(*clazzes):
                 continue  # Support multiple names of a clazz
             done.append(clazz)
             assert clazz.__name__ != "DefaultTable", "Oops, table class not found."
-            assert not hasattr(
-                clazz, method.__name__
-            ), "Oops, class '%s' has method '%s'." % (clazz.__name__, method.__name__)
-            setattr(clazz, method.__name__, method)
+            if not hasattr(clazz, method.__name__):
+                setattr(clazz, method.__name__, method)
         return None
 
     return wrapper