From ecfea8b2538204b33b1a502f295b39debaa1fa3d Mon Sep 17 00:00:00 2001
From: Artem Yarygin <artx19@yandex.ru>
Date: Thu, 4 Feb 2016 17:53:47 +0400
Subject: [PATCH] =?UTF-8?q?=D1=84=D0=B8=D0=BA=D1=81=20=D0=B1=D0=B0=D0=B3?=
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---
 lib/traits/elements.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/traits/elements.php b/lib/traits/elements.php
index 99b7e99..2fd04e9 100644
--- a/lib/traits/elements.php
+++ b/lib/traits/elements.php
@@ -548,7 +548,7 @@ public function addParamsGrouping($fields = [])
     {
         if (is_array($fields) && !empty($fields))
         {
-            $this->groupingParams = array_merge($this->groupingParams, $fields);
+            $this->groupingParams = array_merge(is_array($this->groupingParams) ? $this->groupingParams : [], $fields);
         }
     }