diff --git a/src/asammdf/gui/widgets/plot.py b/src/asammdf/gui/widgets/plot.py
index 6029eabe1..f2a5566d0 100644
--- a/src/asammdf/gui/widgets/plot.py
+++ b/src/asammdf/gui/widgets/plot.py
@@ -2240,7 +2240,11 @@ def channel_selection_item_changed(self, top_left, bottom_right, roles):
             palette.setBrush(QtGui.QPalette.ColorGroup.Active, QtGui.QPalette.ColorRole.WindowText, brush)
             palette.setBrush(QtGui.QPalette.ColorGroup.Inactive, QtGui.QPalette.ColorRole.WindowText, brush)
 
-            brush = QtGui.QBrush(item._current_background_color)
+            brush = QtGui.QBrush(
+                item._current_background_color
+                if item._current_background_color is not None
+                else QtCore.Qt.BrushStyle.NoBrush
+            )
             palette.setBrush(QtGui.QPalette.ColorGroup.Active, QtGui.QPalette.ColorRole.Window, brush)
             palette.setBrush(QtGui.QPalette.ColorGroup.Inactive, QtGui.QPalette.ColorRole.Window, brush)