diff --git a/katrain/gui/badukpan.py b/katrain/gui/badukpan.py
index 17d0fbb..df3dc62 100644
--- a/katrain/gui/badukpan.py
+++ b/katrain/gui/badukpan.py
@@ -380,6 +380,10 @@ class BadukPanWidget(Widget):
         current_node = katrain.game.current_node
         player, next_player = current_node.player, current_node.next_player
 
+        board_size_x, board_size_y = katrain.game.board_size
+        if len(self.gridpos_x) < board_size_x or len(self.gridpos_y) < board_size_y:
+            return  # race condition
+
         with self.canvas.after:
             self.canvas.after.clear()
             self.active_pv_moves = []
diff --git a/setup.py b/setup.py
index fb31b19..d3ecd5c 100644
--- a/setup.py
+++ b/setup.py
@@ -41,7 +41,7 @@ setup(
         "wheel",
         "setuptools",
         "importlib_resources ;python_version<'3.7'",
-        "pygame",  # some mac versions need this for kivy
+        "pygame;platform_system=='Darwin'",  # some mac versions need this for kivy
         "cython>=0.24,<=0.29.14,!=0.27,!=0.27.2",  # kivy wants this
         "kivy_deps.glew;platform_system=='Windows'",
         "kivy_deps.sdl2;platform_system=='Windows'",