diff --git a/Request/BatchParser.php b/Request/BatchParser.php
index d07812497..3d92e5eff 100644
--- a/Request/BatchParser.php
+++ b/Request/BatchParser.php
@@ -39,7 +39,7 @@ public function parse(Request $request)
         }
 
         foreach ($queries as $i => &$query) {
-            $query = $query + self::$queriesDefaultValue;
+            $query = array_filter($query) + self::$queriesDefaultValue;
 
             if (!is_string($query[static::PARAM_QUERY])) {
                 throw new BadRequestHttpException(sprintf('%s is not a valid query', json_encode($query[static::PARAM_QUERY])));
diff --git a/Request/Parser.php b/Request/Parser.php
index 41cfd7435..b7944de52 100644
--- a/Request/Parser.php
+++ b/Request/Parser.php
@@ -86,11 +86,11 @@ private function getParsedBody(Request $request)
     private function getParams(Request $request, array $data = [])
     {
         // Add default request parameters
-        $data = $data + [
-            static::PARAM_QUERY => null,
-            static::PARAM_VARIABLES => null,
-            static::PARAM_OPERATION_NAME => null,
-        ];
+        $data = array_filter($data) + [
+                static::PARAM_QUERY => null,
+                static::PARAM_VARIABLES => null,
+                static::PARAM_OPERATION_NAME => null,
+            ];
 
         // Keep a reference to the query-string
         $qs = $request->query;