diff --git a/alacritty_config_gui.py b/alacritty_config_gui.py
index 982263e..10c2294 100644
--- a/alacritty_config_gui.py
+++ b/alacritty_config_gui.py
@@ -208,7 +208,7 @@ class KeyBindingDialog(QtWidgets.QDialog):
         self.layout.addRow(QtWidgets.QLabel('Key'), self.key)
 
         self.mods = QtWidgets.QListWidget()
-        for option in self.MODIFIERS:
+        for option in MODIFIERS:
             self.mods.addItem(option)
         self.mods.setSelectionMode(QtWidgets.QAbstractItemView.ExtendedSelection)
         self.layout.addRow(QtWidgets.QLabel('Mods'), self.mods)
@@ -609,11 +609,11 @@ class Font(ConfigWidget):
         offset_y = QtWidgets.QSpinBox()
         offset_y.setValue(config.get('offset', {}).get('y'))
         scale_with_dpi = QtWidgets.QCheckBox()
-        scale_with_dpi.setChecked(config.get('scale_with_dpi'))
+        scale_with_dpi.setChecked(config.get('scale_with_dpi', False))
         size = QtWidgets.QDoubleSpinBox()
         size.setValue(config.get('size'))
         use_thin_strokes = QtWidgets.QCheckBox()
-        use_thin_strokes.setChecked(config.get('use_thin_strokes'))
+        use_thin_strokes.setChecked(config.get('use_thin_strokes', False))
 
         normal_config = config.get('normal', {})
         normal = FontSelect(normal_config['family'], normal_config['style'])