diff --git a/strat/main.py b/strat/main.py
index 70f604e..3ad2b2f 100644
--- a/strat/main.py
+++ b/strat/main.py
@@ -2,7 +2,10 @@ import numpy as np
 
 
 def avg(ls: list) -> int:
-    return sum(ls) / len(ls)
+    if len != 0:
+        return sum(ls) / len(ls)
+    else:
+        return 0
 
 
 def decision(h1, h2):