diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
index c573c369e9e3..6ce8ce61a119 100644
--- a/lib/matplotlib/backend_bases.py
+++ b/lib/matplotlib/backend_bases.py
@@ -3357,10 +3357,14 @@ def configure_subplots(self, *args):
tool_fig = manager.canvas.figure
tool_fig.subplots_adjust(top=0.9)
self.subplot_tool = widgets.SubplotTool(self.canvas.figure, tool_fig)
- tool_fig.canvas.mpl_connect(
- "close_event", lambda e: delattr(self, "subplot_tool"))
- self.canvas.mpl_connect(
+ cid = self.canvas.mpl_connect(
"close_event", lambda e: manager.destroy())
+
+ def on_tool_fig_close(e):
+ self.canvas.mpl_disconnect(cid)
+ del self.subplot_tool
+
+ tool_fig.canvas.mpl_connect("close_event", on_tool_fig_close)
manager.show()
return self.subplot_tool
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