diff --git a/SeedDMS_Core/Core/inc.ClassDMS.php b/SeedDMS_Core/Core/inc.ClassDMS.php
index 293ccea2e..3988f2b08 100644
--- a/SeedDMS_Core/Core/inc.ClassDMS.php
+++ b/SeedDMS_Core/Core/inc.ClassDMS.php
@@ -3174,14 +3174,14 @@ class SeedDMS_Core_DMS {
 	function getStatisticalData($type='') { /* {{{ */
 		switch($type) {
 			case 'docsperuser':
-				$queryStr = "select concat(b.`fullName`, ' (', b.`login`, ')') as `key`, count(`owner`) as total from `tblDocuments` a left join `tblUsers` b on a.`owner`=b.`id` group by `owner`, b.`fullName`";
+				$queryStr = "select ".$this->db->concat(array('b.`fullName`', "' ('", 'b.`login`', "')'"))." as `key`, count(`owner`) as total from `tblDocuments` a left join `tblUsers` b on a.`owner`=b.`id` group by `owner`, b.`fullName`";
 				$resArr = $this->db->getResultArray($queryStr);
 				if (!$resArr)
 					return false;
 
 				return $resArr;
 			case 'foldersperuser':
-				$queryStr = "select concat(b.`fullName`, ' (', b.`login`, ')') as `key`, count(`owner`) as total from `tblFolders` a left join `tblUsers` b on a.`owner`=b.`id` group by `owner`, b.`fullName`";
+				$queryStr = "select ".$this->db->concat(array('b.`fullName`', "' ('", 'b.`login`', "')'"))." as `key`, count(`owner`) as total from `tblFolders` a left join `tblUsers` b on a.`owner`=b.`id` group by `owner`, b.`fullName`";
 				$resArr = $this->db->getResultArray($queryStr);
 				if (!$resArr)
 					return false;
diff --git a/SeedDMS_Core/Core/inc.DBAccessPDO.php b/SeedDMS_Core/Core/inc.DBAccessPDO.php
index a272fffb9..e48f5f3d5 100644
--- a/SeedDMS_Core/Core/inc.DBAccessPDO.php
+++ b/SeedDMS_Core/Core/inc.DBAccessPDO.php
@@ -346,6 +346,27 @@ class SeedDMS_Core_DatabaseAccess {
 		return str_replace('`', '"', $text);
 	} /* }}} */
 
+	/**
+	 * Return sql to concat strings or fields
+	 *
+	 * @param array $arr list of field names or strings
+	 * @return string concated string
+	 */
+	function concat($arr) { /* {{{ */
+		switch($this->_driver) {
+		case 'mysql':
+			return 'concat('.implode(',', $arr).')';
+			break;
+		case 'pgsql':
+			return implode(' || ', $arr);
+			break;
+		case 'sqlite':
+			return implode(' || ', $arr);
+			break;
+		}
+		return '';
+	} /* }}} */
+
 	/**
 	 * Execute SQL query and return result
 	 *