Merge pull request matplotlib#14282 from ImportanceOfBeingErnest/fix-toolmngr-destroy-subplots

timhoffm · web-flow · commit 7d924401eba7 · 2019-05-21T20:29:07.000+02:00
Fix toolmanager's destroy subplots in tk
diff --git a/lib/matplotlib/backends/_backend_tk.py b/lib/matplotlib/backends/_backend_tk.py
@@ -844,8 +844,9 @@ 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):
