diff --git a/src/SaveRelationsBehavior.php b/src/SaveRelationsBehavior.php
index 37b4676..5e7b1b5 100644
--- a/src/SaveRelationsBehavior.php
+++ b/src/SaveRelationsBehavior.php
@@ -182,6 +182,9 @@ class SaveRelationsBehavior extends Behavior
             foreach ($modelClass::primaryKey() as $modelAttribute) {
                 if (array_key_exists($modelAttribute, $data) && !empty($data[$modelAttribute])) {
                     $fks[$modelAttribute] = $data[$modelAttribute];
+                } else {
+                    $fks = [];
+                    break;
                 }
             }
             if (empty($fks)) {
diff --git a/tests/SaveRelationsBehaviorTest.php b/tests/SaveRelationsBehaviorTest.php
index 5a1e7b7..ee86de2 100644
--- a/tests/SaveRelationsBehaviorTest.php
+++ b/tests/SaveRelationsBehaviorTest.php
@@ -326,6 +326,21 @@ class SaveRelationsBehaviorTest extends \PHPUnit_Framework_TestCase
         );
     }
 
+    public function testCreateHasManyRelationWithOneOfTheMissingKeyOfCompositeFk()
+    {
+        $project = Project::findOne(1);
+        $project->links = [
+            [
+                'language' => 'fr',
+            ]
+        ];
+        $this->assertCount(1, $project->links, 'Project should have 1 links after assignment');
+        $this->assertTrue(
+            $project->links[0]->isNewRecord,
+            'Related link without one of the missed key of composite fk must be is new record'
+        );
+    }
+
     public function testSaveNewHasManyRelationWithCompositeFksAsArrayShouldSucceed()
     {
         $project = Project::findOne(1);