@@ -30,7 +30,7 @@ def bubble_sort(collection):
 [-45, -5, -2]
 """
 length = len(collection)
-for i in range(length):
+for i in range(length-1):
 for j in range(length-1):
 if collection[j] > collection[j+1]:
 collection[j], collection[j+1] = collection[j+1], collection[j]