diff --git a/lib/matplotlib/backends/backend_qt.py b/lib/matplotlib/backends/backend_qt.py
index 5b74176befff..e8a137d6a565 100644
--- a/lib/matplotlib/backends/backend_qt.py
+++ b/lib/matplotlib/backends/backend_qt.py
@@ -333,7 +333,8 @@ def keyReleaseEvent(self, event):
def resizeEvent(self, event):
frame = sys._getframe()
- if frame.f_code is frame.f_back.f_code: # Prevent PyQt6 recursion.
+ # Prevent PyQt6 recursion, but sometimes frame.f_back is None
+ if frame.f_code is getattr(frame.f_back, 'f_code', None):
return
w = event.size().width() * self.device_pixel_ratio
h = event.size().height() * self.device_pixel_ratio
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