diff --git a/alacritty_config_gui.py b/alacritty_config_gui.py
index d5f719d..2663e66 100644
--- a/alacritty_config_gui.py
+++ b/alacritty_config_gui.py
@@ -485,7 +485,9 @@ class ConfigWidget(QtWidgets.QWidget):
             elif type(widget) is dict:
                 state[name] = self.widgets_to_state(widget)
             else:
-                state[name] = self.widget_value(widget)
+                val = self.widget_value(widget)
+                if val is not None:
+                    state[name] = val
         return state
 
     def gather_state(self):