diff --git a/src/GUI/gui.py b/src/GUI/gui.py
index 1e0c5ab..f110256 100644
--- a/src/GUI/gui.py
+++ b/src/GUI/gui.py
@@ -580,7 +580,10 @@ class ControlStationUI(QMainWindow):
             cells = round(voltage / 3.95)
 
             # 計算電量百分比
-            percentage = (voltage / cells - 3.7) / 0.5 * 100
+            if cells == 0:
+                percentage = 0
+            else:
+                percentage = (voltage / cells - 3.7) / 0.5 * 100
             
             # 根據百分比設置顏色
             if percentage < 20: