diff --git a/packages/backend/src/server/api/mastodon/endpoints/auth.ts b/packages/backend/src/server/api/mastodon/endpoints/auth.ts
index c5e7589ce..267128a6a 100644
--- a/packages/backend/src/server/api/mastodon/endpoints/auth.ts
+++ b/packages/backend/src/server/api/mastodon/endpoints/auth.ts
@@ -3,6 +3,7 @@ import { AuthHelpers } from "@/server/api/mastodon/helpers/auth.js";
 import { convertId, IdType } from "@/misc/convert-id.js";
 import { AuthConverter } from "@/server/api/mastodon/converters/auth.js";
 import { v4 as uuid } from "uuid";
+import { MastoApiError } from "@/server/api/mastodon/middleware/catch-errors.js";
 
 export function setupEndpointsAuth(router: Router): void {
     router.post("/v1/apps", async (ctx) => {
@@ -30,9 +31,7 @@ export function setupEndpointsAuthRoot(router: Router): void {
         if (state) param += `&state=${state}`;
         if (redirect_uri) param += `&redirect_uri=${redirect_uri}`;
         const client = client_id ? client_id : "";
-        ctx.redirect(
-            `${Buffer.from(client.toString(), "base64").toString()}?${param}`,
-        );
+        ctx.redirect(`${Buffer.from(client.toString(), "base64").toString()}?${param}`);
     });
 
     router.post("/oauth/token", async (ctx) => {
@@ -50,19 +49,14 @@ export function setupEndpointsAuthRoot(router: Router): void {
         if (body.code) {
             token = body.code;
         }
-        try {
-            const accessToken = await AuthHelpers.getAuthToken(body.client_secret, token ? token : "");
-            const ret = {
-                access_token: accessToken,
-                token_type: "Bearer",
-                scope: body.scope || "read write follow push",
-                created_at: Math.floor(new Date().getTime() / 1000),
-            };
-            ctx.body = ret;
-        } catch (err: any) {
-            console.error(err);
-            ctx.status = 401;
-            ctx.body = err.response.data;
-        }
+        const accessToken = await AuthHelpers.getAuthToken(body.client_secret, token ? token : "").catch(_ => {
+            throw new MastoApiError(401);
+        });
+        ctx.body = {
+            access_token: accessToken,
+            token_type: "Bearer",
+            scope: body.scope || "read write follow push",
+            created_at: Math.floor(new Date().getTime() / 1000),
+        };
     });
 }
diff --git a/packages/backend/src/server/index.ts b/packages/backend/src/server/index.ts
index edf5ef1f4..929efd73b 100644
--- a/packages/backend/src/server/index.ts
+++ b/packages/backend/src/server/index.ts
@@ -32,6 +32,7 @@ import { initializeStreamingServer } from "./api/streaming.js";
 import removeTrailingSlash from "koa-remove-trailing-slashes";
 import { koaBody } from "koa-body";
 import { setupEndpointsAuthRoot } from "@/server/api/mastodon/endpoints/auth.js";
+import { CatchErrorsMiddleware } from "@/server/api/mastodon/middleware/catch-errors.js";
 export const serverLogger = new Logger("server", "gray", false);
 
 // Init app
@@ -134,6 +135,7 @@ mastoRouter.use(async (ctx, next) => {
 	await next();
 });
 
+mastoRouter.use(CatchErrorsMiddleware);
 setupEndpointsAuthRoot(mastoRouter);
 
 // Register router