diff --git a/web/comp/page_layout.ts b/web/comp/page_layout.ts
index cf11b5d..023950b 100644
--- a/web/comp/page_layout.ts
+++ b/web/comp/page_layout.ts
@@ -1,6 +1,6 @@
 import { AnyNode, Attrs, E, Elem } from "ren/node.ts";
 import { classNames } from "ren/attrs.ts";
-import { Context, iterLangs, Lang } from "../context.ts";
+import { Context, getLangHref, iterLangs, Lang } from "../context.ts";
 
 export function PageLayout(ctx: Context, children: AnyNode[]): Elem {
   return E("div", { id: "main" }, [
@@ -63,6 +63,5 @@ export function ChangeLang(ctx: Context): AnyNode {
 }
 
 export function ChangeLangBtn(ctx: Context, lang: Lang): AnyNode {
-  const prefix = lang === Lang.Rus ? "" : `/${lang}`;
-  return E("a", { "href": prefix + ctx.locPath }, lang);
+  return E("a", { "href": getLangHref(lang, ctx.locPath) }, lang);
 }
diff --git a/web/context.ts b/web/context.ts
index f9115e3..6b88679 100644
--- a/web/context.ts
+++ b/web/context.ts
@@ -6,6 +6,14 @@ export interface Context {
   tr: Translations;
 }
 
+export function getLangHref(lang: Lang, url: string): string {
+  return getLangUrlPrefix(lang) + url;
+}
+
+export function getLangUrlPrefix(lang: Lang): string {
+  return lang === Lang.Rus ? "" : `/${lang}`;
+}
+
 export function iterLangs(): Lang[] {
   return [Lang.Eng, Lang.Rus];
 }
diff --git a/web/server.ts b/web/server.ts
index 2367be4..0fae73e 100644
--- a/web/server.ts
+++ b/web/server.ts
@@ -1,6 +1,6 @@
 import { StrRenderer } from "ren/str.ts";
 import { Layout } from "./comp/layout.ts";
-import { Context, Lang } from "./context.ts";
+import { Context, getLangHref, Lang } from "./context.ts";
 import { E404Page } from "./views/e404.ts";
 import * as log from "./log.ts";
 import { HomePage } from "./views/home.ts";
@@ -9,6 +9,7 @@ import { IngredientsPage } from "./views/ingredients.ts";
 import { RestIngredientRepo } from "./repo/ingredient/rest.ts";
 import rusTranslates from "./translates/rus.ts";
 import type { Translations } from "./translates/rus.ts";
+import { E500Page } from "./views/e500.ts";
 
 if (import.meta.main) {
   await main();
@@ -66,29 +67,30 @@ async function handleGet(req: Request) {
       wrapNode: Layout.bind(null, ctx),
       onVisitAttr: ([key, value]) => {
         if (key === "lhref") {
-          const prefix = ctx.lang === Lang.Rus || !value.startsWith("/")
-            ? ""
-            : `/${ctx.lang}`;
-          return ["href", prefix + value];
+          return ["href", getLangHref(ctx.lang, value)];
         } else {
           return [key, value];
         }
       },
     });
 
-    if (ctx.locPath === "/") {
-      return createHtmlResponse(ren.render(HomePage(ctx)));
-    } else if (ctx.locPath === "/recipes") {
-      return createHtmlResponse(ren.render(RecipesPage(ctx)));
-    } else if (ctx.locPath === "/ingredients") {
-      const repo = new RestIngredientRepo();
-      const ingredients = await repo.fetchIngredients(ctx.lang);
+    try {
+      if (ctx.locPath === "/") {
+        return createHtmlResponse(ren.render(HomePage(ctx)));
+      } else if (ctx.locPath === "/recipes") {
+        return createHtmlResponse(ren.render(RecipesPage(ctx)));
+      } else if (ctx.locPath === "/ingredients") {
+        const repo = new RestIngredientRepo();
+        const ingredients = await repo.fetchIngredients(ctx.lang);
 
-      return createHtmlResponse(
-        ren.render(IngredientsPage(ctx, { ingredients })),
-      );
-    } else {
-      return createHtmlResponse(ren.render(E404Page(ctx)), 404);
+        return createHtmlResponse(
+          ren.render(IngredientsPage(ctx, { ingredients })),
+        );
+      } else {
+        return createHtmlResponse(ren.render(E404Page(ctx)), 404);
+      }
+    } catch (_) {
+      return createHtmlResponse(ren.render(E500Page(ctx)), 500);
     }
   }
 }
diff --git a/web/translates/eng.ts b/web/translates/eng.ts
index 35cde34..28e6ef0 100644
--- a/web/translates/eng.ts
+++ b/web/translates/eng.ts
@@ -6,4 +6,5 @@ export default {
   Ingredients: "Ingredients",
   Source_code: "Source code",
   Page_not_found: "Page not found",
+  Internal_server_error: "Internal server error",
 } as Translations;
diff --git a/web/translates/rus.ts b/web/translates/rus.ts
index 162e430..9859ec0 100644
--- a/web/translates/rus.ts
+++ b/web/translates/rus.ts
@@ -4,6 +4,7 @@ export const rus = {
   Ingredients: "Ингредиенты",
   Source_code: "Исходный код",
   Page_not_found: "Страница не найдена",
+  Internal_server_error: "Внутренняя ошибка сервера",
 };
 
 export default rus;
diff --git a/web/views/e500.ts b/web/views/e500.ts
new file mode 100644
index 0000000..7aeff05
--- /dev/null
+++ b/web/views/e500.ts
@@ -0,0 +1,15 @@
+import { PageLayout } from "../comp/page_layout.ts";
+import { AnyNode, E } from "ren/node.ts";
+import { classNames } from "ren/attrs.ts";
+import { Context } from "../context.ts";
+import { H3 } from "../uikit/typo.ts";
+
+export function E500Page(ctx: Context): AnyNode {
+  return PageLayout(ctx, [E500(ctx)]);
+}
+
+export function E500(ctx: Context): AnyNode {
+  return E("div", classNames("content-width"), [
+    H3(ctx.tr.Internal_server_error),
+  ]);
+}