diff --git a/.changeset/thirty-berries-bow.md b/.changeset/thirty-berries-bow.md
new file mode 100644
index 0000000000..a2ef63edb2
--- /dev/null
+++ b/.changeset/thirty-berries-bow.md
@@ -0,0 +1,5 @@
+---
+'gitbook': patch
+---
+
+Fix error when accessing some not found pages.
diff --git a/packages/gitbook/src/app/(site)/(content)/ClientContexts.tsx b/packages/gitbook/src/app/middleware/(site)/(content)/ClientContexts.tsx
similarity index 100%
rename from packages/gitbook/src/app/(site)/(content)/ClientContexts.tsx
rename to packages/gitbook/src/app/middleware/(site)/(content)/ClientContexts.tsx
diff --git a/packages/gitbook/src/app/(site)/(content)/RocketLoaderDetector.tsx b/packages/gitbook/src/app/middleware/(site)/(content)/RocketLoaderDetector.tsx
similarity index 100%
rename from packages/gitbook/src/app/(site)/(content)/RocketLoaderDetector.tsx
rename to packages/gitbook/src/app/middleware/(site)/(content)/RocketLoaderDetector.tsx
diff --git a/packages/gitbook/src/app/(site)/(content)/[[...pathname]]/PageClientLayout.tsx b/packages/gitbook/src/app/middleware/(site)/(content)/[[...pathname]]/PageClientLayout.tsx
similarity index 100%
rename from packages/gitbook/src/app/(site)/(content)/[[...pathname]]/PageClientLayout.tsx
rename to packages/gitbook/src/app/middleware/(site)/(content)/[[...pathname]]/PageClientLayout.tsx
diff --git a/packages/gitbook/src/app/(site)/(content)/[[...pathname]]/loading.tsx b/packages/gitbook/src/app/middleware/(site)/(content)/[[...pathname]]/loading.tsx
similarity index 100%
rename from packages/gitbook/src/app/(site)/(content)/[[...pathname]]/loading.tsx
rename to packages/gitbook/src/app/middleware/(site)/(content)/[[...pathname]]/loading.tsx
diff --git a/packages/gitbook/src/app/(site)/(content)/[[...pathname]]/not-found.tsx b/packages/gitbook/src/app/middleware/(site)/(content)/[[...pathname]]/not-found.tsx
similarity index 100%
rename from packages/gitbook/src/app/(site)/(content)/[[...pathname]]/not-found.tsx
rename to packages/gitbook/src/app/middleware/(site)/(content)/[[...pathname]]/not-found.tsx
diff --git a/packages/gitbook/src/app/(site)/(content)/[[...pathname]]/page.tsx b/packages/gitbook/src/app/middleware/(site)/(content)/[[...pathname]]/page.tsx
similarity index 100%
rename from packages/gitbook/src/app/(site)/(content)/[[...pathname]]/page.tsx
rename to packages/gitbook/src/app/middleware/(site)/(content)/[[...pathname]]/page.tsx
diff --git a/packages/gitbook/src/app/(site)/(content)/layout.tsx b/packages/gitbook/src/app/middleware/(site)/(content)/layout.tsx
similarity index 100%
rename from packages/gitbook/src/app/(site)/(content)/layout.tsx
rename to packages/gitbook/src/app/middleware/(site)/(content)/layout.tsx
diff --git a/packages/gitbook/src/app/(site)/(core)/robots.txt/route.ts b/packages/gitbook/src/app/middleware/(site)/(core)/robots.txt/route.ts
similarity index 100%
rename from packages/gitbook/src/app/(site)/(core)/robots.txt/route.ts
rename to packages/gitbook/src/app/middleware/(site)/(core)/robots.txt/route.ts
diff --git a/packages/gitbook/src/app/(site)/(core)/sitemap.xml/route.ts b/packages/gitbook/src/app/middleware/(site)/(core)/sitemap.xml/route.ts
similarity index 100%
rename from packages/gitbook/src/app/(site)/(core)/sitemap.xml/route.ts
rename to packages/gitbook/src/app/middleware/(site)/(core)/sitemap.xml/route.ts
diff --git a/packages/gitbook/src/app/(site)/(core)/~gitbook/icon/route.tsx b/packages/gitbook/src/app/middleware/(site)/(core)/~gitbook/icon/route.tsx
similarity index 100%
rename from packages/gitbook/src/app/(site)/(core)/~gitbook/icon/route.tsx
rename to packages/gitbook/src/app/middleware/(site)/(core)/~gitbook/icon/route.tsx
diff --git a/packages/gitbook/src/app/(site)/(core)/~gitbook/ogimage/[pageId]/route.tsx b/packages/gitbook/src/app/middleware/(site)/(core)/~gitbook/ogimage/[pageId]/route.tsx
similarity index 100%
rename from packages/gitbook/src/app/(site)/(core)/~gitbook/ogimage/[pageId]/route.tsx
rename to packages/gitbook/src/app/middleware/(site)/(core)/~gitbook/ogimage/[pageId]/route.tsx
diff --git a/packages/gitbook/src/app/(site)/error.tsx b/packages/gitbook/src/app/middleware/(site)/error.tsx
similarity index 100%
rename from packages/gitbook/src/app/(site)/error.tsx
rename to packages/gitbook/src/app/middleware/(site)/error.tsx
diff --git a/packages/gitbook/src/app/(site)/fetch.ts b/packages/gitbook/src/app/middleware/(site)/fetch.ts
similarity index 100%
rename from packages/gitbook/src/app/(site)/fetch.ts
rename to packages/gitbook/src/app/middleware/(site)/fetch.ts
diff --git a/packages/gitbook/src/app/(site)/layout.tsx b/packages/gitbook/src/app/middleware/(site)/layout.tsx
similarity index 100%
rename from packages/gitbook/src/app/(site)/layout.tsx
rename to packages/gitbook/src/app/middleware/(site)/layout.tsx
diff --git a/packages/gitbook/src/app/(space)/~gitbook/pdf/PageControlButtons.tsx b/packages/gitbook/src/app/middleware/(space)/~gitbook/pdf/PageControlButtons.tsx
similarity index 100%
rename from packages/gitbook/src/app/(space)/~gitbook/pdf/PageControlButtons.tsx
rename to packages/gitbook/src/app/middleware/(space)/~gitbook/pdf/PageControlButtons.tsx
diff --git a/packages/gitbook/src/app/(space)/~gitbook/pdf/PrintButton.tsx b/packages/gitbook/src/app/middleware/(space)/~gitbook/pdf/PrintButton.tsx
similarity index 100%
rename from packages/gitbook/src/app/(space)/~gitbook/pdf/PrintButton.tsx
rename to packages/gitbook/src/app/middleware/(space)/~gitbook/pdf/PrintButton.tsx
diff --git a/packages/gitbook/src/app/(space)/~gitbook/pdf/layout.tsx b/packages/gitbook/src/app/middleware/(space)/~gitbook/pdf/layout.tsx
similarity index 100%
rename from packages/gitbook/src/app/(space)/~gitbook/pdf/layout.tsx
rename to packages/gitbook/src/app/middleware/(space)/~gitbook/pdf/layout.tsx
diff --git a/packages/gitbook/src/app/(space)/~gitbook/pdf/page.tsx b/packages/gitbook/src/app/middleware/(space)/~gitbook/pdf/page.tsx
similarity index 100%
rename from packages/gitbook/src/app/(space)/~gitbook/pdf/page.tsx
rename to packages/gitbook/src/app/middleware/(space)/~gitbook/pdf/page.tsx
diff --git a/packages/gitbook/src/app/(space)/~gitbook/pdf/pdf.css b/packages/gitbook/src/app/middleware/(space)/~gitbook/pdf/pdf.css
similarity index 100%
rename from packages/gitbook/src/app/(space)/~gitbook/pdf/pdf.css
rename to packages/gitbook/src/app/middleware/(space)/~gitbook/pdf/pdf.css
diff --git a/packages/gitbook/src/app/(space)/~gitbook/pdf/pointer.ts b/packages/gitbook/src/app/middleware/(space)/~gitbook/pdf/pointer.ts
similarity index 100%
rename from packages/gitbook/src/app/(space)/~gitbook/pdf/pointer.ts
rename to packages/gitbook/src/app/middleware/(space)/~gitbook/pdf/pointer.ts
diff --git a/packages/gitbook/src/components/DocumentView/Embed.tsx b/packages/gitbook/src/components/DocumentView/Embed.tsx
index f07a08d421..77a2dda90b 100644
--- a/packages/gitbook/src/components/DocumentView/Embed.tsx
+++ b/packages/gitbook/src/components/DocumentView/Embed.tsx
@@ -5,6 +5,7 @@ import ReactDOM from 'react-dom';
 
 import { Card } from '@/components/primitives';
 import { getEmbedByUrlInSpace, getEmbedByUrl } from '@/lib/api';
+import { getContentSecurityPolicyNonce } from '@/lib/csp';
 import { tcls } from '@/lib/tailwind';
 
 import { BlockProps } from './Block';
@@ -13,8 +14,7 @@ import { IntegrationBlock } from './Integration';
 
 export async function Embed(props: BlockProps<gitbookAPI.DocumentBlockEmbed>) {
     const { block, context, ...otherProps } = props;
-    const headersList = await headers();
-    const nonce = headersList.get('x-nonce') || undefined;
+    const nonce = await getContentSecurityPolicyNonce();
 
     ReactDOM.preload('https://cdn.iframe.ly/embed.js', { as: 'script', nonce });
 
diff --git a/packages/gitbook/src/lib/csp.ts b/packages/gitbook/src/lib/csp.ts
index 663a2a14ac..660e557ad3 100644
--- a/packages/gitbook/src/lib/csp.ts
+++ b/packages/gitbook/src/lib/csp.ts
@@ -1,19 +1,18 @@
 import { SpaceIntegrationScript } from '@gitbook/api';
 import { merge } from 'content-security-policy-merger';
 import { headers } from 'next/headers';
+import { assert } from 'ts-essentials';
 
 import { assetsDomain } from './assets';
 import { filterOutNullable } from './typescript';
+
 /**
  * Get the current nonce for the current request.
  */
 export async function getContentSecurityPolicyNonce(): Promise<string> {
     const headersList = await headers();
     const nonce = headersList.get('x-nonce');
-    if (!nonce) {
-        throw new Error('No nonce found in headers');
-    }
-
+    assert(nonce, 'x-nonce should be set in the headers by the middleware');
     return nonce;
 }
 
diff --git a/packages/gitbook/src/lib/pages.ts b/packages/gitbook/src/lib/pages.ts
index d6e485d9b9..991c40fa36 100644
--- a/packages/gitbook/src/lib/pages.ts
+++ b/packages/gitbook/src/lib/pages.ts
@@ -5,6 +5,7 @@ import {
     RevisionPageGroup,
     RevisionPageType,
 } from '@gitbook/api';
+import { headers } from 'next/headers';
 
 export type AncestorRevisionPage = RevisionPageDocument | RevisionPageGroup;
 
diff --git a/packages/gitbook/src/lib/pointer.ts b/packages/gitbook/src/lib/pointer.ts
index 400fdd51d1..0e201db0a5 100644
--- a/packages/gitbook/src/lib/pointer.ts
+++ b/packages/gitbook/src/lib/pointer.ts
@@ -1,4 +1,5 @@
 import { headers } from 'next/headers';
+import { assert } from 'ts-essentials';
 
 import { SiteContentPointer, SpaceContentPointer } from './api';
 
@@ -7,28 +8,34 @@ import { SiteContentPointer, SpaceContentPointer } from './api';
  */
 export async function getSiteContentPointer(): Promise<SiteContentPointer> {
     const headersList = await headers();
+
     const spaceId = headersList.get('x-gitbook-content-space');
+    assert(spaceId, 'x-gitbook-content-space should be set in the headers by the middleware');
+
     const siteId = headersList.get('x-gitbook-content-site');
+    assert(siteId, 'x-gitbook-content-site should be set in the headers by the middleware');
+
     const organizationId = headersList.get('x-gitbook-content-organization');
-    const siteSpaceId = headersList.get('x-gitbook-content-site-space');
-    const siteSectionId = headersList.get('x-gitbook-content-site-section');
-    const siteShareKey = headersList.get('x-gitbook-content-site-share-key');
+    assert(
+        organizationId,
+        'x-gitbook-content-organization should be set in the headers by the middleware',
+    );
 
-    if (!spaceId || !siteId || !organizationId) {
-        throw new Error(
-            'getSiteContentPointer is called outside the scope of a request processed by the middleware',
-        );
-    }
+    const siteSectionId = headersList.get('x-gitbook-content-site-section') ?? undefined;
+    const siteSpaceId = headersList.get('x-gitbook-content-site-space') ?? undefined;
+    const siteShareKey = headersList.get('x-gitbook-content-site-share-key') ?? undefined;
+    const revisionId = headersList.get('x-gitbook-content-revision') ?? undefined;
+    const changeRequestId = headersList.get('x-gitbook-content-changerequest') ?? undefined;
 
     const pointer: SiteContentPointer = {
         siteId,
         spaceId,
-        siteSectionId: siteSectionId ?? undefined,
-        siteSpaceId: siteSpaceId ?? undefined,
-        siteShareKey: siteShareKey ?? undefined,
         organizationId,
-        revisionId: headersList.get('x-gitbook-content-revision') ?? undefined,
-        changeRequestId: headersList.get('x-gitbook-content-changerequest') ?? undefined,
+        siteSectionId,
+        siteSpaceId,
+        siteShareKey,
+        revisionId,
+        changeRequestId,
     };
 
     return pointer;
@@ -40,17 +47,17 @@ export async function getSiteContentPointer(): Promise<SiteContentPointer> {
  */
 export async function getSpacePointer(): Promise<SpaceContentPointer> {
     const headersList = await headers();
+
     const spaceId = headersList.get('x-gitbook-content-space');
-    if (!spaceId) {
-        throw new Error(
-            'getSpacePointer is called outside the scope of a request processed by the middleware',
-        );
-    }
+    assert(spaceId, 'x-gitbook-content-space should be set in the headers by the middleware');
+
+    const revisionId = headersList.get('x-gitbook-content-revision') ?? undefined;
+    const changeRequestId = headersList.get('x-gitbook-content-changerequest') ?? undefined;
 
     const pointer: SpaceContentPointer = {
         spaceId,
-        revisionId: headersList.get('x-gitbook-content-revision') ?? undefined,
-        changeRequestId: headersList.get('x-gitbook-content-changerequest') ?? undefined,
+        revisionId,
+        changeRequestId,
     };
 
     return pointer;
diff --git a/packages/gitbook/src/middleware.ts b/packages/gitbook/src/middleware.ts
index 7378145fca..71a3b56f4f 100644
--- a/packages/gitbook/src/middleware.ts
+++ b/packages/gitbook/src/middleware.ts
@@ -5,7 +5,6 @@ import jwt from 'jsonwebtoken';
 import type { ResponseCookie } from 'next/dist/compiled/@edge-runtime/cookies';
 import { NextResponse, NextRequest } from 'next/server';
 import hash from 'object-hash';
-import rison from 'rison';
 
 import {
     PublishedContentWithCache,
@@ -278,7 +277,7 @@ export async function middleware(request: NextRequest) {
         headers.set('x-gitbook-visitor-token', resolved.visitorToken);
     }
 
-    const target = new URL(rewritePathname, request.nextUrl.toString());
+    const target = new URL(joinPath('/middleware', rewritePathname), request.nextUrl.toString());
     target.search = url.search;
 
     const response = writeCookies(