diff --git a/lib/matplotlib/backends/_backend_tk.py b/lib/matplotlib/backends/_backend_tk.py
index f8516584187c..0017a50b9a2c 100644
--- a/lib/matplotlib/backends/_backend_tk.py
+++ b/lib/matplotlib/backends/_backend_tk.py
@@ -635,14 +635,15 @@ def save_figure(self, *args):
tkinter.messagebox.showerror("Error saving file", str(e))
def set_history_buttons(self):
- if self._nav_stack._pos > 0:
- self._buttons['Back']['state'] = tk.NORMAL
- else:
- self._buttons['Back']['state'] = tk.DISABLED
- if self._nav_stack._pos < len(self._nav_stack._elements) - 1:
- self._buttons['Forward']['state'] = tk.NORMAL
- else:
- self._buttons['Forward']['state'] = tk.DISABLED
+ state_map = {True: tk.NORMAL, False: tk.DISABLED}
+ can_back = self._nav_stack._pos > 0
+ can_forward = self._nav_stack._pos < len(self._nav_stack._elements) - 1
+
+ if "Back" in self._buttons:
+ self._buttons['Back']['state'] = state_map[can_back]
+
+ if "Forward" in self._buttons:
+ self._buttons['Forward']['state'] = state_map[can_forward]
class ToolTip:
diff --git a/lib/matplotlib/tests/test_backend_tk.py b/lib/matplotlib/tests/test_backend_tk.py
index b56b25a717fb..70eed6d75a81 100644
--- a/lib/matplotlib/tests/test_backend_tk.py
+++ b/lib/matplotlib/tests/test_backend_tk.py
@@ -100,3 +100,16 @@ def target():
except subprocess.CalledProcessError:
pytest.fail("Subprocess failed to test intended behavior")
assert proc.stdout.count("success") == 1
+
+
+@pytest.mark.backend('TkAgg', skip_on_importerror=True)
+def test_missing_back_button():
+ from matplotlib.backends.backend_tkagg import NavigationToolbar2Tk
+ class Toolbar(NavigationToolbar2Tk):
+ # only display the buttons we need
+ toolitems = [t for t in NavigationToolbar2Tk.toolitems if
+ t[0] in ('Home', 'Pan', 'Zoom')]
+
+ fig = plt.figure()
+ # this should not raise
+ Toolbar(fig.canvas, fig.canvas.manager.window)
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