diff --git a/app/api/commission/tickets/[id]/messages/[messageId]/route.test.ts b/app/api/commission/tickets/[id]/messages/[messageId]/route.test.ts
index 0863776..3d1a73e 100644
--- a/app/api/commission/tickets/[id]/messages/[messageId]/route.test.ts
+++ b/app/api/commission/tickets/[id]/messages/[messageId]/route.test.ts
@@ -38,7 +38,7 @@ describe("commission message deletion", () => {
   beforeEach(() => {
     process.env.BETTER_AUTH_URL = "https://guide.sudloh.com";
     vi.clearAllMocks();
-    authorizeTicket.mockResolvedValue({ ticket: { userId: ownerId }, user: { id: ownerId } });
+    authorizeTicket.mockResolvedValue({ ticket: { userId: ownerId, status: "open" }, user: { id: ownerId } });
     deleteWhere.mockImplementation(() => ({ returning: deleteReturning }));
     deleteReturning.mockResolvedValue([{ imageObjectKey: "commission/messages/image-1" }]);
     updateWhere.mockResolvedValue(undefined);
@@ -66,6 +66,15 @@ describe("commission message deletion", () => {
     expect(notifyCommission).toHaveBeenCalledWith(ticketId, ownerId);
   });
 
+  it("rejects deletion when the ticket is closed", async () => {
+    authorizeTicket.mockResolvedValue({ ticket: { userId: ownerId, status: "closed" }, user: { id: ownerId } });
+    const response = await DELETE(deletionRequest(), context());
+    expect(response.status).toBe(409);
+    expect(tx.delete).not.toHaveBeenCalled();
+    expect(deleteObject).not.toHaveBeenCalled();
+    expect(notifyCommission).not.toHaveBeenCalled();
+  });
+
   it("leaves storage and notifications untouched when no owned message exists", async () => {
     deleteReturning.mockResolvedValue([]);
     const response = await DELETE(deletionRequest(), context());
diff --git a/app/api/commission/tickets/[id]/messages/[messageId]/route.ts b/app/api/commission/tickets/[id]/messages/[messageId]/route.ts
index b36bfd3..611fe7d 100644
--- a/app/api/commission/tickets/[id]/messages/[messageId]/route.ts
+++ b/app/api/commission/tickets/[id]/messages/[messageId]/route.ts
@@ -15,6 +15,7 @@ export async function DELETE(request: Request,
     const { id, messageId } = await context.params;
     if (!z.uuid().safeParse(messageId).success) throw new HttpError(404, "message-not-found");
     const { ticket, user } = await authorizeTicket(id);
+    if (ticket.status !== "open") throw new HttpError(409, "ticket-closed");
     await limitRequest("commission-message-delete", user.id, 30);
     const imageObjectKey = await getDb().transaction(async (tx) => {
       const [message] = await tx.delete(commissionMessages)
diff --git a/components/commission/ticket-chat.tsx b/components/commission/ticket-chat.tsx
index 253b01c..b297900 100644
--- a/components/commission/ticket-chat.tsx
+++ b/components/commission/ticket-chat.tsx
@@ -869,7 +869,7 @@ export function CommissionTicketChat({
                               <ReplyIcon />
                             </Button>
                           )}
-                          {mine && (
+                          {mine && status === "open" && (
                             <AlertDialog
                               open={deleteFor === message.id}
                               onOpenChange={(open) =>