matplotlib
diff --git a/‎lib/matplotlib/backends/qt_compat.py
Copy file name to clipboardExpand all lines: lib/matplotlib/backends/qt_compat.py
+6-1Lines changed: 6 additions & 1 deletion b/‎lib/matplotlib/backends/qt_compat.py
Copy file name to clipboardExpand all lines: lib/matplotlib/backends/qt_compat.py
+6-1Lines changed: 6 additions & 1 deletion
@@ -57,7 +57,12 @@
 # requested backend actually matches).  Use dict.__getitem__ to avoid
 # triggering backend resolution (which can result in a partially but
 # incompletely imported backend_qt5).
-elif dict.__getitem__(mpl.rcParams, "backend") in ["Qt5Agg", "Qt5Cairo"]:
+elif (
+        isinstance(dict.__getitem__(mpl.rcParams, "backend"), str) and
+        dict.__getitem__(mpl.rcParams, "backend").lower() in [
+            "qt5agg", "qt5cairo"
+        ]
+):
     if QT_API_ENV in ["pyqt5", "pyside2"]:
         QT_API = _ETS[QT_API_ENV]
     else: