chat interface, validate user id

src/server/routers/chat.ts

@@ -9,12 +9,12 @@ import { eq } from 'drizzle-orm';
 import { clerkClient, auth } from '@clerk/nextjs/server'
 export const chatRouter = router({
   getSession: publicProcedure.query(async () => {
-		const clerk = await clerkClient()
     const { userId } = await auth();
-    const user = await clerk.users.getUser(userId?userId:"")
-    if (user == undefined) {
+    if (!userId) {
       throw new TRPCError({ message: "chat is only available to signed in users", code: 'UNAUTHORIZED' });
     }
+		const clerk = await clerkClient()
+    const user = await clerk.users.getUser(userId)
     let session = await db.query.chatSession.findFirst({
       where(fields, operators) {
         return operators.eq(fields.userId, user.id)