diff --git a/extensions/elasticsearch/CHANGELOG.md b/extensions/elasticsearch/CHANGELOG.md
index 58fa69419f..b1670a8f45 100644
--- a/extensions/elasticsearch/CHANGELOG.md
+++ b/extensions/elasticsearch/CHANGELOG.md
@@ -5,6 +5,7 @@ Yii Framework 2 elasticsearch extension Change Log
 -----------------------
 
 - Bug #5662: Elasticsearch AR updateCounters() now uses explicitly `groovy` script for updating making it compatible with ES >1.3.0 (cebe)
+- Bug #6065: `ActiveRecord::unlink()` was failing in some situations when working with relations via array valued attributes (cebe)
 
 
 2.0.0 October 12, 2014
diff --git a/framework/db/BaseActiveRecord.php b/framework/db/BaseActiveRecord.php
index 17320cc18e..62a04013a7 100644
--- a/framework/db/BaseActiveRecord.php
+++ b/framework/db/BaseActiveRecord.php
@@ -1295,7 +1295,7 @@ abstract class BaseActiveRecord extends Model implements ActiveRecordInterface
                         if (($key = array_search($model->$a, $this->$b, false)) !== false) {
                             $values = $this->$b;
                             unset($values[$key]);
-                            $this->$b = $values;
+                            $this->$b = array_values($values);
                         }
                     } else {
                         $this->$b = null;
diff --git a/tests/unit/extensions/elasticsearch/ActiveRecordTest.php b/tests/unit/extensions/elasticsearch/ActiveRecordTest.php
index 0fbfb827f8..8eebd305c0 100644
--- a/tests/unit/extensions/elasticsearch/ActiveRecordTest.php
+++ b/tests/unit/extensions/elasticsearch/ActiveRecordTest.php
@@ -812,6 +812,31 @@ class ActiveRecordTest extends ElasticSearchTestCase
         $this->assertFalse(isset($items[2]));
     }
 
+    /**
+     * https://github.com/yiisoft/yii2/issues/6065
+     */
+    public function testArrayAttributeRelationUnLinkBrokenArray()
+    {
+        /* @var $order Order */
+        $order = Order::find()->where(['id' => 1])->one();
+
+        $itemIds = $order->itemsArray;
+        $removeId = reset($itemIds);
+        $item = Item::get($removeId);
+        $order->unlink('itemsByArrayValue', $item);
+        $this->afterSave();
+
+        $items = $order->itemsByArrayValue;
+        $this->assertEquals(1, count($items));
+        $this->assertFalse(isset($items[$removeId]));
+
+        // check also after refresh
+        $this->assertTrue($order->refresh());
+        $items = $order->itemsByArrayValue;
+        $this->assertEquals(1, count($items));
+        $this->assertFalse(isset($items[$removeId]));
+    }
+
     /**
      * @expectedException \yii\base\NotSupportedException
      */