From 86d5a69cabf841d7057d60dd7a72fd60454d48de Mon Sep 17 00:00:00 2001
From: Mouamle <mouamle.hasan@gmail.com>
Date: Fri, 13 Dec 2019 14:48:32 +0300
Subject: [PATCH] probable null pointer exception eliminated.

---
 .../java/com/github/hussainderry/cache/ConcurrentCache.java    | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/java/com/github/hussainderry/cache/ConcurrentCache.java b/src/main/java/com/github/hussainderry/cache/ConcurrentCache.java
index 1ecc0c2..e0612fb 100755
--- a/src/main/java/com/github/hussainderry/cache/ConcurrentCache.java
+++ b/src/main/java/com/github/hussainderry/cache/ConcurrentCache.java
@@ -62,7 +62,8 @@ public void put(K key, V value){
      * @return The old value corresponding to the provided key
      * */
     public V putIfAbsent(K key, V value){
-        return mMap.putIfAbsent(key, new Holder<>(value)).getValue();
+        Holder<V> vHolder = mMap.putIfAbsent(key, new Holder<>(value));
+        return vHolder != null ? vHolder.getValue() : null;
     }
 
     /**