diff --git a/src/pages/dashboard/Content/Support/TicketList/TicketList.tsx b/src/pages/dashboard/Content/Support/TicketList/TicketList.tsx
index 1f3e4ea..1da0518 100644
--- a/src/pages/dashboard/Content/Support/TicketList/TicketList.tsx
+++ b/src/pages/dashboard/Content/Support/TicketList/TicketList.tsx
@@ -136,7 +136,7 @@ function sortTicketsByUpdateTime(ticket1: Ticket, ticket2: Ticket) {
 }
 
 function sortTicketsByUnread(ticket1: Ticket, ticket2: Ticket) {
-	const isUnread1 = ticket1.user === ticket1.top_message.user_id;
-	const isUnread2 = ticket2.user === ticket2.top_message.user_id;
+	const isUnread1 = ticket1.user === ticket1?.top_message.user_id;
+	const isUnread2 = ticket2.user === ticket2?.top_message.user_id;
 	return Number(isUnread2) - Number(isUnread1);
 }