Backport PR #14282: Fix toolmanager's destroy subplots in tk

timhoffm · MeeseeksDev[bot] · commit a703d8735f0b · 2019-05-21T18:29:33.000Z
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):
