FIX:

jklymak · jklymak · commit d20cb14c12c4 · 2018-02-20T20:22:56.000-07:00
diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
@@ -1427,7 +1427,6 @@ def clf(self, keep_observers=False):
         self._suptitle = None
         if self.get_constrained_layout():
             layoutbox.nonetree(self._layoutbox)
-            self.init_layoutbox()
         self.stale = True
 
     def clear(self, keep_observers=False):
