diff --git a/src/ert/gui/tools/plot/customize/customize_plot_dialog.py b/src/ert/gui/tools/plot/customize/customize_plot_dialog.py
index ffb95f26f12..38e9d1d8a93 100644
--- a/src/ert/gui/tools/plot/customize/customize_plot_dialog.py
+++ b/src/ert/gui/tools/plot/customize/customize_plot_dialog.py
@@ -152,6 +152,8 @@ def toggleCustomizationDialog(self):
             self._customization_dialog.show()
 
     def switchPlotConfigHistory(self, key_def):
+        if key_def is None:
+            return
         key = key_def["key"]
         if key != self._plot_config_key:
             if key not in self._plot_configs:
diff --git a/src/ert/gui/tools/plot/plot_window.py b/src/ert/gui/tools/plot/plot_window.py
index b608f83d217..1fcd777edb5 100644
--- a/src/ert/gui/tools/plot/plot_window.py
+++ b/src/ert/gui/tools/plot/plot_window.py
@@ -218,6 +218,8 @@ def addDock(
     @showWaitCursorWhileWaiting
     def keySelected(self):
         key_def = self.getSelectedKey()
+        if key_def is None:
+            return
         self._plot_customizer.switchPlotConfigHistory(key_def)
 
         available_widgets = [