diff --git a/CHANGELOG.md b/CHANGELOG.md
index ccb61b5..edc24ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,21 @@
+## 0.4.2 - 2017-05-12
+
+### Changed
+* Nothing
+
+### Added
+* Nothing
+
+### Deprecated
+* Nothing
+
+### Removed
+* Nothing
+
+### Fixed
+* fixed issue [#12](https://github.com/dotkernel/dot-mapper/issues/12) - error when saving multiple new entities
+
+
 ## 0.4.1 - 2017-05-02
 
 ### Changed
diff --git a/src/Mapper/AbstractDbMapper.php b/src/Mapper/AbstractDbMapper.php
index b60e7a8..61e589c 100644
--- a/src/Mapper/AbstractDbMapper.php
+++ b/src/Mapper/AbstractDbMapper.php
@@ -300,9 +300,8 @@ protected function processSave(EntityInterface $entity, array $options)
 
         $primaryKey = array_intersect_key($data, array_flip($primaryColumns));
         $primaryKey = array_filter($primaryKey);
-        $mapKey = implode(',', $primaryKey);
 
-        $isNew = empty($primaryKey) && !isset($this->identityMap[$mapKey]);
+        $isNew = empty($primaryKey);
 
         /** @var ResponseCollection $event */
         $event = $this->dispatchEvent(
@@ -329,6 +328,8 @@ protected function processSave(EntityInterface $entity, array $options)
         }
 
         if ($success && $isNew) {
+            $primaryKey = $entity->extractProperties($primaryColumns);
+            $mapKey = implode(',', $primaryKey);
             $this->identityMap[$mapKey] = $entity;
         }