diff --git a/src/main/java/net/helenus/core/HelenusSession.java b/src/main/java/net/helenus/core/HelenusSession.java
index 02734b9..2e1fe7f 100644
--- a/src/main/java/net/helenus/core/HelenusSession.java
+++ b/src/main/java/net/helenus/core/HelenusSession.java
@@ -345,7 +345,9 @@ public class HelenusSession extends AbstractSessionOperations implements Closeab
           if (pojo == null || pojo == HelenusSession.deleted) {
             cache.remove(cacheKey);
           } else {
-            cache.put(cacheKey, pojo);
+            if (pojo != null) {
+              cache.put(cacheKey, pojo);
+            }
           }
         }
       }