diff --git a/static/js/chat_sockets.js b/static/js/chat_sockets.js
index b89d013..2c83d94 100644
--- a/static/js/chat_sockets.js
+++ b/static/js/chat_sockets.js
@@ -93,9 +93,15 @@ chatSocket.onmessage = function (e) {
             if (document.querySelector(".list_linked_tickets") !== null || document.querySelector(".list_unlinked_tickets") !== null) {
                 document.querySelector(".list_unlinked_tickets").innerHTML = data.tickets_wo_manager_html
                 if (el_tab !== null) {
-                    document.querySelector(".tab_user_messanger.select").classList.remove("select")
-                    document.querySelector(`[data-cur-receiver-item="${old_item_tab_user}"]`).classList.add("select")
-                    document.querySelector(`[data-cur-receiver-item="${old_item_tab_user}"]`).scrollIntoView({behavior: "smooth"});
+                    let select_tab = document.querySelector(".tab_user_messanger.select")
+                    if (select_tab) {
+                        select_tab.classList.remove("select")
+                    }
+                    let old_insert_tab = document.querySelector(`[data-cur-receiver-item="${old_item_tab_user}"]`)
+                    if (old_insert_tab) {
+                        old_insert_tab.classList.add("select")
+                        old_insert_tab.scrollIntoView({behavior: "smooth"});
+                    }
                 }
             }
 
@@ -105,8 +111,11 @@ chatSocket.onmessage = function (e) {
                 document.querySelector(".list_linked_tickets").innerHTML = data.tickets_w_manager_html
                 if (el_tab !== null){
                     document.querySelector(".tab_user_messanger.select").classList.remove("select")
-                    document.querySelector(`[data-cur-receiver-item="${old_item_tab_user}"]` ).classList.add("select")
-                    document.querySelector(`[data-cur-receiver-item="${old_item_tab_user}"]` ).scrollIntoView({behavior: "smooth"});
+                    let old_insert_tab = document.querySelector(`[data-cur-receiver-item="${old_item_tab_user}"]`)
+                    if (old_insert_tab) {
+                        old_insert_tab.classList.add("select")
+                        old_insert_tab.scrollIntoView({behavior: "smooth"});
+                    }
                 }
             }