Merge pull request #14294 from meeseeksmachine/auto-backport-of-pr-14282-on-v3.1.x

timhoffm · web-flow · commit 5c5e638e6527 · 2019-05-21T22:24:36.000+02:00
Backport PR #14282 on branch v3.1.x (Fix toolmanager's destroy subplots in tk)
diff --git a/lib/matplotlib/backends/_backend_tk.py b/lib/matplotlib/backends/_backend_tk.py
@@ -912,8 +912,9 @@ def init_window(self):
         self.window.protocol("WM_DELETE_WINDOW", self.destroy)
 
     def destroy(self, *args, **kwargs):
-        self.window.destroy()
-        self.window = None
+        if self.window is not None:
+            self.window.destroy()
+            self.window = None
 
 
 class HelpTk(backend_tools.ToolHelpBase):
