diff --git a/library/lcd/lcd_comm.py b/library/lcd/lcd_comm.py
index 4e2714fe..ef08cc81 100644
--- a/library/lcd/lcd_comm.py
+++ b/library/lcd/lcd_comm.py
@@ -420,7 +420,7 @@ def DisplayLineGraph(self, x: int, y: int, width: int, height: int,
 
         step = width / len(values)
         # pre compute yScale multiplier value
-        yScale = height / (max_value - min_value)
+        yScale = (height / (max_value - min_value)) if (max_value - min_value) != 0 else 0
 
         plotsX = []
         plotsY = []