diff --git a/octoprint_psucontrol/static/js/psucontrol.js b/octoprint_psucontrol/static/js/psucontrol.js
index 74ccc8c..e98bb85 100644
--- a/octoprint_psucontrol/static/js/psucontrol.js
+++ b/octoprint_psucontrol/static/js/psucontrol.js
@@ -29,14 +29,18 @@ $(function() {
         };
 
         self.onSettingsBeforeSave = function () {
-            if (self.scripts_gcode_psucontrol_post_on() != self.settings.scripts.gcode["psucontrol_post_on"]()) {
-                self.settings.plugins.psucontrol.scripts_gcode_psucontrol_post_on = self.scripts_gcode_psucontrol_post_on;
-                self.settings.scripts.gcode["psucontrol_post_on"](self.scripts_gcode_psucontrol_post_on());
+            if (self.scripts_gcode_psucontrol_post_on() !== undefined) {
+                if (self.scripts_gcode_psucontrol_post_on() != self.settings.scripts.gcode["psucontrol_post_on"]()) {
+                    self.settings.plugins.psucontrol.scripts_gcode_psucontrol_post_on = self.scripts_gcode_psucontrol_post_on;
+                    self.settings.scripts.gcode["psucontrol_post_on"](self.scripts_gcode_psucontrol_post_on());
+                }
             }
 
-            if (self.scripts_gcode_psucontrol_pre_off() != self.settings.scripts.gcode["psucontrol_pre_off"]()) {
-                self.settings.plugins.psucontrol.scripts_gcode_psucontrol_pre_off = self.scripts_gcode_psucontrol_pre_off;
-                self.settings.scripts.gcode["psucontrol_pre_off"](self.scripts_gcode_psucontrol_pre_off());
+            if (self.scripts_gcode_psucontrol_pre_off() !== undefined) {
+                if (self.scripts_gcode_psucontrol_pre_off() != self.settings.scripts.gcode["psucontrol_pre_off"]()) {
+                    self.settings.plugins.psucontrol.scripts_gcode_psucontrol_pre_off = self.scripts_gcode_psucontrol_pre_off;
+                    self.settings.scripts.gcode["psucontrol_pre_off"](self.scripts_gcode_psucontrol_pre_off());
+                }
             }
         };