From 73bedb1522db403dce913ea44e55313cb45cde34 Mon Sep 17 00:00:00 2001
From: Romain Quetiez <romain.quetiez@combodo.com>
Date: Mon, 5 Dec 2016 10:00:27 +0000
Subject: [PATCH] (Retrofit from trunk) Continuing [r4488] N.536 Regression
 introduced in [r4469] (N.505), itself fixing a regression introduced in
 [r4404]. REQUIRES TESTING

SVN:2.3[4491]
---
 core/dbobjectsearch.class.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/core/dbobjectsearch.class.php b/core/dbobjectsearch.class.php
index 5a060d793..1f5d917f9 100644
--- a/core/dbobjectsearch.class.php
+++ b/core/dbobjectsearch.class.php
@@ -1426,7 +1426,10 @@ class DBObjectSearch extends DBSearch
 				}
 			}
 			$sRawId .= $bGetCount;
-			$sRawId .= implode(',', $aSelectedClasses); // Unions may alter the list of selected columns
+			if (is_array($aSelectedClasses))
+			{
+				$sRawId .= implode(',', $aSelectedClasses); // Unions may alter the list of selected columns
+			}
 			$sOqlId = md5($sRawId);
 		}
 		else