fix

src/app/blog/[[...tag]]/page.tsx

@@ -31,7 +31,7 @@ export default async function Blog({
   if (pageNumber > numberOfPages) {
     notFound();
   }
-  const loggedIn = (await auth()) != null;
+  const loggedIn = (await auth())?.user != null;
   const tags = await getTags(loggedIn);
 
   return (

src/app/blog/post/[slug]/page.tsx

@@ -13,7 +13,7 @@ export default async function Post({
   if (!post) {
     notFound();
   }
-  const loggedIn = (await auth()) != null;
+  const loggedIn = (await auth())?.user != null;
   return (
     <>
       <PostDisplay post={post} loggedIn={loggedIn} />

src/app/blog/write/[[...slug]]/page.tsx

@@ -9,7 +9,7 @@ export default async function WritePage({
 }: {
   params: Promise<{ slug: string[] | undefined }>;
 }) {
-  if (!(await auth())) {
+  if ((await auth())?.user == null) {
     signIn();
   }
 

src/app/blog/write/action.ts

@@ -14,7 +14,7 @@ export async function savePostServer(
   is_draft: boolean,
   existingSlug?: string
 ) {
-  if (!(await auth())) {
+  if ((await auth())?.user != null) {
     throw new Error("Not authenticated");
   }