diff --git a/src/Dto2DataConverter.php b/src/Dto2DataConverter.php
index 67d41f0..f6fce26 100644
--- a/src/Dto2DataConverter.php
+++ b/src/Dto2DataConverter.php
@@ -65,7 +65,7 @@ class Dto2DataConverter
 
     public function convertArrayByMap($data, ?array $map, array $tags = []): ?array
     {
-        $isAssociative = count($data) && !array_key_exists(0, $data);
+        // $isAssociative = count($data) && !array_key_exists(0, $data);
 
         $tempValue = [];
         foreach ($data as $key => $item) {
diff --git a/tests/unit/Converter/FillTest.php b/tests/unit/Converter/FillTest.php
index 0900a39..30151d0 100644
--- a/tests/unit/Converter/FillTest.php
+++ b/tests/unit/Converter/FillTest.php
@@ -6,6 +6,8 @@ use Rinsvent\DTO2Data\Dto2DataConverter;
 use Rinsvent\DTO2Data\Tests\unit\Converter\fixtures\FillTest\Author;
 use Rinsvent\DTO2Data\Tests\unit\Converter\fixtures\FillTest\Bar;
 use Rinsvent\DTO2Data\Tests\unit\Converter\fixtures\FillTest\BuyRequest;
+use Rinsvent\DTO2Data\Tests\unit\Converter\fixtures\FillTest\Collection;
+use Rinsvent\DTO2Data\Tests\unit\Converter\fixtures\FillTest\CollectionItem;
 use Rinsvent\DTO2Data\Tests\unit\Converter\fixtures\FillTest\HelloRequest;
 use Rinsvent\DTO2Data\Tests\unit\Converter\fixtures\FillTest\UUID;
 
@@ -69,6 +71,13 @@ class FillTest extends \Codeception\Test\Unit
         $bar->barField = 32;
         $helloRequest->bar = $bar;
         $helloRequest->uuid = new UUID('qwerqw-qwerqwe-werqw-qwerqw');
+        $collection = new Collection();
+        $collection->items = [
+            new CollectionItem('3'),
+            new CollectionItem('1'),
+            new CollectionItem('2'),
+        ];
+        $helloRequest->collection = $collection;
 
         $dto = $dto2DataConverter->convert($helloRequest);
         // codecept_debug(json_encode($dto));
@@ -106,7 +115,18 @@ class FillTest extends \Codeception\Test\Unit
             "bar" => [
                 "barField" => 32
             ],
-            'uuid' => 'qwerqw-qwerqwe-werqw-qwerqw'
+            'uuid' => 'qwerqw-qwerqwe-werqw-qwerqw',
+            'collection' => [
+                [
+                    'value' => '3',
+                ],
+                [
+                    'value' => '1',
+                ],
+                [
+                    'value' => '2',
+                ],
+            ],
         ], $dto);
     }
 }
diff --git a/tests/unit/Converter/fixtures/FillTest/Collection.php b/tests/unit/Converter/fixtures/FillTest/Collection.php
new file mode 100644
index 0000000..6458f25
--- /dev/null
+++ b/tests/unit/Converter/fixtures/FillTest/Collection.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Rinsvent\DTO2Data\Tests\unit\Converter\fixtures\FillTest;
+
+class Collection implements \Iterator
+{
+    public array $items = [];
+    private $position = 0;
+
+    public function rewind()
+    {
+        $this->position = 0;
+    }
+
+    public function current()
+    {
+        return $this->items[$this->position];
+    }
+
+    public function key()
+    {
+        return $this->position;
+    }
+
+    public function next()
+    {
+        ++$this->position;
+    }
+
+    public function valid()
+    {
+        return isset($this->items[$this->position]);
+    }
+}
diff --git a/tests/unit/Converter/fixtures/FillTest/CollectionItem.php b/tests/unit/Converter/fixtures/FillTest/CollectionItem.php
new file mode 100644
index 0000000..ce8380c
--- /dev/null
+++ b/tests/unit/Converter/fixtures/FillTest/CollectionItem.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace Rinsvent\DTO2Data\Tests\unit\Converter\fixtures\FillTest;
+
+class CollectionItem
+{
+    public string $value;
+
+    public function __construct(string $value)
+    {
+        $this->value = $value;
+    }
+}
diff --git a/tests/unit/Converter/fixtures/FillTest/HelloRequest.php b/tests/unit/Converter/fixtures/FillTest/HelloRequest.php
index fac8df5..fab3d2c 100644
--- a/tests/unit/Converter/fixtures/FillTest/HelloRequest.php
+++ b/tests/unit/Converter/fixtures/FillTest/HelloRequest.php
@@ -21,4 +21,5 @@ class HelloRequest
     public BarInterface $bar;
     #[PropertyPath(path: 'uuid.id')]
     public UUID $uuid;
+    public Collection $collection;
 }
diff --git a/tests/unit/Converter/fixtures/FillTest/HelloSchema.php b/tests/unit/Converter/fixtures/FillTest/HelloSchema.php
index 9162f63..f5a84c1 100644
--- a/tests/unit/Converter/fixtures/FillTest/HelloSchema.php
+++ b/tests/unit/Converter/fixtures/FillTest/HelloSchema.php
@@ -26,6 +26,9 @@ class HelloSchema extends Schema
         'bar' => [
             'barField'
         ],
-        'uuid'
+        'uuid',
+        'collection' => [
+            'value'
+        ],
     ];
 }