ensure assistant response parsed correctly (#2823)

web/src/app/chat/shared/[chatId]/page.tsx

@@ -9,7 +9,10 @@ import { redirect } from "next/navigation";
 import { BackendChatSession } from "../../interfaces";
 import { SharedChatDisplay } from "./SharedChatDisplay";
 import { Persona } from "@/app/admin/assistants/interfaces";
-import { fetchAssistantsSS } from "@/lib/assistants/fetchAssistantsSS";
+import {
+  FetchAssistantsResponse,
+  fetchAssistantsSS,
+} from "@/lib/assistants/fetchAssistantsSS";
 import FunctionalHeader from "@/components/chat_search/Header";
 import { defaultPersona } from "@/app/admin/assistants/lib";
 
@@ -44,7 +47,8 @@ export default async function Page({ params }: { params: { chatId: string } }) {
   const authTypeMetadata = results[0] as AuthTypeMetadata | null;
   const user = results[1] as User | null;
   const chatSession = results[2] as BackendChatSession | null;
-  const availableAssistants = results[3] as Persona[] | null;
+  const assistantsResponse = results[3] as FetchAssistantsResponse | null;
+  const [availableAssistants, _] = assistantsResponse ?? [[], null];
 
   const authDisabled = authTypeMetadata?.authType === "disabled";
   if (!authDisabled && !user) {
@@ -54,11 +58,12 @@ export default async function Page({ params }: { params: { chatId: string } }) {
   if (user && !user.is_verified && authTypeMetadata?.requiresVerification) {
     return redirect("/auth/waiting-on-verification");
   }
-  const persona = chatSession?.persona_id
-    ? (availableAssistants?.find((p) => p.id === chatSession.persona_id) ??
-      availableAssistants?.[0] ??
-      null)
-    : (availableAssistants?.[0] ?? defaultPersona);
+
+  const persona: Persona =
+    chatSession?.persona_id && availableAssistants?.length
+      ? (availableAssistants.find((p) => p.id === chatSession.persona_id) ??
+        defaultPersona)
+      : (availableAssistants?.[0] ?? defaultPersona);
 
   return (
     <div>