From b128f56a6c2df6464a73928826a84905db39fa4e Mon Sep 17 00:00:00 2001
From: kwoyke <krzysztofwoyke@gmail.com>
Date: Thu, 23 Jan 2020 23:43:48 +0100
Subject: [PATCH] BAEL-3781: Fix Slope One implementation (#8570)

---
 .../main/java/com/baeldung/algorithms/slope_one/SlopeOne.java   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/slope_one/SlopeOne.java b/algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/slope_one/SlopeOne.java
index d5eea279de..bfcafdaef2 100644
--- a/algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/slope_one/SlopeOne.java
+++ b/algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/slope_one/SlopeOne.java
@@ -98,7 +98,7 @@ public class SlopeOne {
             for (Item j : InputData.items) {
                 if (e.getValue().containsKey(j)) {
                     clean.put(j, e.getValue().get(j));
-                } else {
+                } else if (!clean.containsKey(j)) {
                     clean.put(j, -1.0);
                 }
             }