Index: branches/5.3.x/core/kernel/utility/temp_handler.php
===================================================================
diff -u -N -r16390 -r16503
--- branches/5.3.x/core/kernel/utility/temp_handler.php	(.../temp_handler.php)	(revision 16390)
+++ branches/5.3.x/core/kernel/utility/temp_handler.php	(.../temp_handler.php)	(revision 16503)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: temp_handler.php 16390 2016-11-07 21:50:01Z alex $
+* @version	$Id: temp_handler.php 16503 2016-12-26 18:16:21Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -114,16 +114,27 @@
 		// SessionKey field is required for deleting records from expired sessions
 		$sleep_count = 0;
 		$conn = $this->_getSeparateConnection();
+		$master_ids = $this->_tables->parseTempIds($master_ids);
 
 		do {
 			// acquire lock
 			$conn->ChangeQuery('LOCK TABLES ' . TABLE_PREFIX . 'Semaphores WRITE');
 
-			$sql = 'SELECT SessionKey
+			$another_coping_active = false;
+			$sql = 'SELECT MainIDs
 					FROM ' . TABLE_PREFIX . 'Semaphores
-					WHERE (MainPrefix = ' . $conn->qstr($this->_tables->getPrefix()) . ')';
-			$another_coping_active = $conn->GetOne($sql);
+					WHERE MainPrefix = ' . $conn->qstr($this->_tables->getPrefix()) . ' AND MainIDs <> "0"';
+			$other_semaphores_main_ids = $conn->GetCol($sql);
 
+			foreach ( $other_semaphores_main_ids as $other_semaphore_main_ids ) {
+				$other_semaphore_main_ids = explode(',', $other_semaphore_main_ids);
+
+				if ( array_intersect($master_ids, $other_semaphore_main_ids) ) {
+					$another_coping_active = true;
+					break;
+				}
+			}
+
 			if ( $another_coping_active ) {
 				// another user is coping data from temp table to live -> release lock and try again after 1 second
 				$conn->ChangeQuery('UNLOCK TABLES');
@@ -145,6 +156,7 @@
 			'SessionKey' => $this->Application->GetSID(),
 			'Timestamp' => time(),
 			'MainPrefix' => $this->_tables->getPrefix(),
+			'MainIDs' => implode(',', $master_ids),
 		);
 
 		$conn->doInsert($fields_hash, TABLE_PREFIX . 'Semaphores');
@@ -1391,6 +1403,18 @@
 	}
 
 	/**
+	 * Ensures, that ids are always an array
+	 *
+	 * @param array $ids IDs.
+	 *
+	 * @return array
+	 */
+	public function parseTempIds($ids)
+	{
+		return $this->_parseTempIds($ids);
+	}
+
+	/**
 	 * Checks, that someone is editing selected records and returns true, when no one.
 	 *
 	 * @param Array $ids