diff --git a/website/src/lib/components/docs/DocsLoader.svelte b/website/src/lib/components/docs/DocsLoader.svelte
index 2141fb1d..65b13c8e 100644
--- a/website/src/lib/components/docs/DocsLoader.svelte
+++ b/website/src/lib/components/docs/DocsLoader.svelte
@@ -1,4 +1,6 @@
 <script lang="ts">
+	import { browser } from '$app/environment';
+	import { goto } from '$app/navigation';
 	import { _, locale } from 'svelte-i18n';
 
 	export let path: string;
@@ -17,7 +19,11 @@
 	}
 
 	$: if ($locale) {
-		loadModule(`/src/lib/docs/${$locale}/${path}`);
+		if (modules.hasOwnProperty(`/src/lib/docs/${$locale}/${path}`)) {
+			loadModule(`/src/lib/docs/${$locale}/${path}`);
+		} else if (browser) {
+			goto(`/404`);
+		}
 	}
 </script>
 
diff --git a/website/src/lib/components/docs/docs.ts b/website/src/lib/components/docs/docs.ts
index 770c2d02..e4cb12d2 100644
--- a/website/src/lib/components/docs/docs.ts
+++ b/website/src/lib/components/docs/docs.ts
@@ -51,11 +51,15 @@ export function getPreviousGuide(currentGuide: string): string | undefined {
             return `${previousGuide}/${guides[previousGuide][guides[previousGuide].length - 1]}`;
         }
     } else {
-        let subguideIndex = guides[subguides[0]].indexOf(subguides[1]);
-        if (subguideIndex > 0) {
-            return `${subguides[0]}/${guides[subguides[0]][subguideIndex - 1]}`;
+        if (guides.hasOwnProperty(subguides[0])) {
+            let subguideIndex = guides[subguides[0]].indexOf(subguides[1]);
+            if (subguideIndex > 0) {
+                return `${subguides[0]}/${guides[subguides[0]][subguideIndex - 1]}`;
+            } else {
+                return subguides[0];
+            }
         } else {
-            return subguides[0];
+            return undefined;
         }
     }
 }
@@ -64,21 +68,29 @@ export function getNextGuide(currentGuide: string): string | undefined {
     let subguides = currentGuide.split('/');
 
     if (subguides.length === 1) {
-        if (guides[currentGuide].length === 0) {
-            let keys = Object.keys(guides);
-            let index = keys.indexOf(currentGuide);
-            return keys[index + 1];
+        if (guides.hasOwnProperty(currentGuide)) {
+            if (guides[currentGuide].length === 0) {
+                let keys = Object.keys(guides);
+                let index = keys.indexOf(currentGuide);
+                return keys[index + 1];
+            } else {
+                return `${currentGuide}/${guides[currentGuide][0]}`;
+            }
         } else {
-            return `${currentGuide}/${guides[currentGuide][0]}`;
+            return undefined;
         }
     } else {
-        let subguideIndex = guides[subguides[0]].indexOf(subguides[1]);
-        if (subguideIndex < guides[subguides[0]].length - 1) {
-            return `${subguides[0]}/${guides[subguides[0]][subguideIndex + 1]}`;
+        if (guides.hasOwnProperty(subguides[0])) {
+            let subguideIndex = guides[subguides[0]].indexOf(subguides[1]);
+            if (subguideIndex < guides[subguides[0]].length - 1) {
+                return `${subguides[0]}/${guides[subguides[0]][subguideIndex + 1]}`;
+            } else {
+                let keys = Object.keys(guides);
+                let index = keys.indexOf(subguides[0]);
+                return keys[index + 1];
+            }
         } else {
-            let keys = Object.keys(guides);
-            let index = keys.indexOf(subguides[0]);
-            return keys[index + 1];
+            return undefined;
         }
     }
 }
\ No newline at end of file
diff --git a/website/src/routes/+layout.svelte b/website/src/routes/+layout.svelte
index 43184c38..5c257c9c 100644
--- a/website/src/routes/+layout.svelte
+++ b/website/src/routes/+layout.svelte
@@ -6,11 +6,21 @@
 	import Head from '$lib/components/Head.svelte';
 	import Nav from '$lib/components/Nav.svelte';
 	import Footer from '$lib/components/Footer.svelte';
+	import { languages } from '$lib/languages';
+	import { browser } from '$app/environment';
+	import { goto } from '$app/navigation';
 
 	$: if ($page.params.language === '' && $locale !== 'en') {
 		locale.set('en');
-	} else if ($page.params.language && $locale !== $page.params.language) {
-		locale.set($page.params.language.replace('/', ''));
+	} else if ($page.params.language) {
+		let lang = $page.params.language.replace('/', '');
+		if ($locale !== lang) {
+			if (languages.hasOwnProperty(lang)) {
+				locale.set(lang);
+			} else if (browser) {
+				goto('/404');
+			}
+		}
 	}
 
 	const appRoutes = ['/[...language]/app', '/[...language]/embed'];