diff --git a/src/messenger/webim/install/dbinfo.php b/src/messenger/webim/install/dbinfo.php
index a3111770..a5d8b304 100644
--- a/src/messenger/webim/install/dbinfo.php
+++ b/src/messenger/webim/install/dbinfo.php
@@ -25,6 +25,7 @@ $dbtables = array(
 		"ltoken" => "int NOT NULL",
 		"remote" => "varchar(255)",
 		"referer" => "text",
+		"nextagent" => "int NOT NULL DEFAULT 0",
 		"locale" => "varchar(8)",
 		"lastpinguser" => "datetime DEFAULT 0",
 		"lastpingagent" => "datetime DEFAULT 0",
@@ -66,7 +67,7 @@ $dbtables = array(
 $memtables = array();
 
 $dbtables_can_update = array(
-	"chatthread" => array("agentId", "userTyping", "agentTyping", "messageCount"),
+	"chatthread" => array("agentId", "userTyping", "agentTyping", "messageCount", "nextagent"),
 	"chatmessage" => array("agentId"),
 );
 
diff --git a/src/messenger/webim/install/dbperform.php b/src/messenger/webim/install/dbperform.php
index 6cbf9d77..b64931d8 100644
--- a/src/messenger/webim/install/dbperform.php
+++ b/src/messenger/webim/install/dbperform.php
@@ -94,6 +94,10 @@ if ($act == "silentcreateall") {
 			runsql("ALTER TABLE chatmessage DROP INDEX idx_threadid_ikind", $link);
 		}
 
+		if( in_array("chatthread.nextagent", $absent) ) {
+			runsql("ALTER TABLE chatthread ADD nextagent int NOT NULL DEFAULT 0", $link);
+		}
+
 		$res = runsql("select null from information_schema.statistics where table_name = 'chatmessage' and index_name = 'idx_agentid'", $link);
 		if(mysql_num_rows($res) == 0) {
 			runsql("ALTER TABLE chatmessage ADD INDEX idx_agentid (agentid)", $link);