diff --git a/src/Experimental/Executor/CoroutineExecutor.php b/src/Experimental/Executor/CoroutineExecutor.php
index b473c56..7d985c1 100644
--- a/src/Experimental/Executor/CoroutineExecutor.php
+++ b/src/Experimental/Executor/CoroutineExecutor.php
@@ -34,8 +34,11 @@ use GraphQL\Utils\Utils;
 use SplQueue;
 use stdClass;
 use Throwable;
+use function array_keys;
+use function count;
 use function is_array;
 use function is_string;
+use function range;
 use function sprintf;
 
 class CoroutineExecutor implements Runtime, ExecutorImplementation
@@ -151,9 +154,14 @@ class CoroutineExecutor implements Runtime, ExecutorImplementation
         }
 
         if (is_array($value)) {
-            $array = [];
-            foreach ($value as $item) {
-                $array[] = self::resultToArray($item);
+            $array   = [];
+            $isAssoc = array_keys($value) !== range(0, count($value) - 1);
+            foreach ($value as $key => $item) {
+                if ($isAssoc) {
+                    $array[$key] = self::resultToArray($item);
+                } else {
+                    $array[] = self::resultToArray($item);
+                }
             }
             return $array;
         }
diff --git a/tests/Executor/ExecutorSchemaTest.php b/tests/Executor/ExecutorSchemaTest.php
index 36a2a73..4946c59 100644
--- a/tests/Executor/ExecutorSchemaTest.php
+++ b/tests/Executor/ExecutorSchemaTest.php
@@ -23,9 +23,9 @@ class ExecutorSchemaTest extends TestCase
     {
         $BlogSerializableValueType = new CustomScalarType([
             'name'         => 'JsonSerializableValueScalar',
-            'serialize'    => static function ($value) { return $value; },
-            'parseValue'   => static function ($value) { return $value; },
-            'parseLiteral' => static function ($value) { return $value; },
+            'serialize'    => static function ($value) {
+                return $value;
+            },
         ]);
 
         $BlogArticle = null;
@@ -201,9 +201,7 @@ class ExecutorSchemaTest extends TestCase
                             'keywords'    => ['foo', 'bar', '1', 'true', null],
                         ],
                     ],
-                    'meta' => [
-                        'title' => 'My Article 1 | My Blog'
-                    ]
+                    'meta' => [ 'title' => 'My Article 1 | My Blog' ],
                 ],
             ],
         ];
@@ -223,9 +221,7 @@ class ExecutorSchemaTest extends TestCase
                 'body'        => 'This is a post',
                 'hidden'      => 'This data is not exposed in the schema',
                 'keywords'    => ['foo', 'bar', 1, true, null],
-                'meta'        => [
-                    'title'   => 'My Article 1 | My Blog',
-                ],
+                'meta'        => ['title' => 'My Article 1 | My Blog'],
             ];
         };