diff --git a/panels/temperature.py b/panels/temperature.py
index 35e70251..50c6d944 100644
--- a/panels/temperature.py
+++ b/panels/temperature.py
@@ -255,7 +255,7 @@ class TemperaturePanel(ScreenPanel):
                             logging.info("Setting %s to %d" % (heater, target))
                     else:
                         self._screen.show_popup_message(_("Can't set above the maximum:") + (" %s" % MAX_TEMP))
-            if self.preheat_options[setting]['gcode']:
+            if setting in self.preheat_options and self.preheat_options[setting]['gcode']:
                 # This small delay is needed to properly update the target if the user configured something above
                 # and then changed the target again using the preheat gcode
                 GLib.timeout_add(250, self.preheat_gcode, setting)