fix attribute error

rcomer · rcomer · commit 4f872b96f9d2 · 2022-12-31T10:58:54.000Z
diff --git a/lib/matplotlib/collections.py b/lib/matplotlib/collections.py
@@ -1475,7 +1475,8 @@ def _get_default_facecolor(self):
     def set_alpha(self, alpha):
         # docstring inherited
         super().set_alpha(alpha)
-        self.set_gapcolor(self._original_gapcolor)
+        if self._gapcolor is not None:
+            self.set_gapcolor(self._original_gapcolor)
 
     def set_color(self, c):
         """
