diff --git a/BridgeEmulator/HueObjects/Group.py b/BridgeEmulator/HueObjects/Group.py
index 383f06df2..6e8b81cdc 100644
--- a/BridgeEmulator/HueObjects/Group.py
+++ b/BridgeEmulator/HueObjects/Group.py
@@ -139,7 +139,7 @@ def update_state(self):
                 else:
                     all_on = False
         if any_on:
-            bri = (((bri/lights_on)/254)*100)
+            bri = (((bri/lights_on)/254)*100) if bri > 0 else 0
         return {"all_on": all_on, "any_on": any_on, "avr_bri": int(bri)}
 
     def setV2Action(self, state):