diff --git a/lib/light_accessory.js b/lib/light_accessory.js
index 7a71b8cb..c90f8192 100644
--- a/lib/light_accessory.js
+++ b/lib/light_accessory.js
@@ -99,7 +99,7 @@ getAccessoryCharacteristic(name) {
         }
       })
       .on('set', (value, callback) => {
-        //Switching colors will trigger both hue and saturation to avoid the color command being sent repeatedly. 
+        //Switching colors will trigger both hue and saturation to avoid the color command being sent repeatedly.
         //So the saturation is saved and is sent with the hue
         if (name == Characteristic.Saturation) {
           this.setCachedState(name, value);
@@ -138,7 +138,7 @@ getAccessoryCharacteristic(name) {
         {
           var percentage;
           percentage = Math.floor((this.function_dp_range.bright_range.max - this.function_dp_range.bright_range.min) * value / 100 + this.function_dp_range.bright_range.min); //  value 0~100
-          if (this.workMode.value == 'white') {
+          if (!this.workMode || this.workMode.value === 'white') {
             code = this.brightValue.code;
             value = percentage;
           } else {