diff --git a/src/messenger/webim/libs/chat.php b/src/messenger/webim/libs/chat.php
index 1e1e1102..db6e4eb3 100644
--- a/src/messenger/webim/libs/chat.php
+++ b/src/messenger/webim/libs/chat.php
@@ -682,13 +682,14 @@ function take_thread($thread, $operator)
 			$message_to_post = getstring2_("chat.status.operator.changed", array($operatorName, $thread['agentName']), $thread['locale']);
 		}
 	} else {
-		die("cannot take thread");
+		return false;
 	}
 
 	if ($message_to_post) {
 		post_message($threadid, $kind_events, $message_to_post);
 		post_message($threadid, $kind_avatar, $operator['vcavatar'] ? $operator['vcavatar'] : "");
 	}
+	return true;
 }
 
 function check_for_reassign($thread, $operator)
diff --git a/src/messenger/webim/locales/en/properties b/src/messenger/webim/locales/en/properties
index 8ca66249..a3ee69e8 100644
--- a/src/messenger/webim/locales/en/properties
+++ b/src/messenger/webim/locales/en/properties
@@ -542,6 +542,11 @@ tag.pagination.no_items=Found 0 elements
 tag.pagination.previous=previous
 thread.back_to_search=Go to search
 thread.chat_log=Chat log
+thread.error.cannot_take=Cannot take thread
+thread.error.cannot_take_over=Cannot take over
+thread.error.cannot_view=Cannot view threads
+thread.error.old_browser=Old browser is used, please update it
+thread.error.wrong_thread=Wrong thread
 thread.intro=This page displays chat details and content.
 time.dateformat=%B %d, %Y
 time.locale=en_US
diff --git a/src/messenger/webim/locales/ru/properties b/src/messenger/webim/locales/ru/properties
index 2bbd019d..f47fdf97 100644
--- a/src/messenger/webim/locales/ru/properties
+++ b/src/messenger/webim/locales/ru/properties
@@ -540,6 +540,11 @@ tag.pagination.no_items=
 tag.pagination.previous=предыдущая
 thread.back_to_search=Перейти в поиск
 thread.chat_log=Протокол разговора
+thread.error.cannot_take=Невозможно установить диалог
+thread.error.cannot_take_over=Вы не можете перехватывать диалоги
+thread.error.cannot_view=Вы не можете просматривать диалоги
+thread.error.old_browser=Вы используете устаревший браузер, пожалуйста, обновите его
+thread.error.wrong_thread=Диалог не существует
 thread.intro=На данной странице Вы можете просмотреть диалог.
 time.dateformat=%d %B %Y,
 time.locale=ru_RU.UTF-8
diff --git a/src/messenger/webim/operator/agent.php b/src/messenger/webim/operator/agent.php
index a7cf7a39..b1f61def 100644
--- a/src/messenger/webim/operator/agent.php
+++ b/src/messenger/webim/operator/agent.php
@@ -48,12 +48,18 @@ if (!isset($_GET['token'])) {
 
 	$remote_level = get_remote_level($_SERVER['HTTP_USER_AGENT']);
 	if ($remote_level != "ajaxed") {
-		die("old browser is used, please update it");
+		$errors = array(getlocal("thread.error.old_browser"));
+		start_html_output();
+		expand("../styles/dialogs", getchatstyle(), "error.tpl");
+		exit;
 	}
 
 	$thread = thread_by_id($threadid);
 	if (!$thread || !isset($thread['ltoken'])) {
-		die("wrong thread");
+		$errors = array(getlocal("thread.error.wrong_thread"));
+		start_html_output();
+		expand("../styles/dialogs", getchatstyle(), "error.tpl");
+		exit;
 	}
 
 	$viewonly = verifyparam("viewonly", "/^true$/", false);
@@ -62,7 +68,7 @@ if (!isset($_GET['token'])) {
 	if (!$viewonly && $thread['istate'] == $state_chatting && $operator['operatorid'] != $thread['agentId']) {
 
 		if (!is_capable($can_takeover, $operator)) {
-			$errors = array("Cannot take over");
+			$errors = array(getlocal("thread.error.cannot_take_over"));
 			start_html_output();
 			expand("../styles/dialogs", getchatstyle(), "error.tpl");
 			exit;
@@ -79,9 +85,14 @@ if (!isset($_GET['token'])) {
 	}
 
 	if (!$viewonly) {
-		take_thread($thread, $operator);
+		if(! take_thread($thread, $operator)){
+			$errors = array(getlocal("thread.error.cannot_take"));
+			start_html_output();
+			expand("../styles/dialogs", getchatstyle(), "error.tpl");
+			exit;
+		}
 	} else if (!is_capable($can_viewthreads, $operator)) {
-		$errors = array("Cannot view threads");
+		$errors = array(getlocal("thread.error.cannot_view"));
 		start_html_output();
 		expand("../styles/dialogs", getchatstyle(), "error.tpl");
 		exit;