diff --git a/packages/backend/src/server/api/endpoints/drive/files/create.ts b/packages/backend/src/server/api/endpoints/drive/files/create.ts
index 877e76677e..ac7863ec7e 100644
--- a/packages/backend/src/server/api/endpoints/drive/files/create.ts
+++ b/packages/backend/src/server/api/endpoints/drive/files/create.ts
@@ -86,7 +86,9 @@ export default define(meta, async (ps, user, _, file, cleanup) => {
 		const driveFile = await addFile({ user, path: file.path, name, comment: ps.comment, folderId: ps.folderId, force: ps.force, sensitive: ps.isSensitive });
 		return await DriveFiles.pack(driveFile, { self: true });
 	} catch (e) {
-		apiLogger.error(e);
+		if (e instanceof Error || typeof e === 'string') {
+			apiLogger.error(e);
+		}
 		throw new ApiError();
 	} finally {
 		cleanup!();
diff --git a/packages/backend/src/server/api/endpoints/following/create.ts b/packages/backend/src/server/api/endpoints/following/create.ts
index 96aede4550..b840ab7696 100644
--- a/packages/backend/src/server/api/endpoints/following/create.ts
+++ b/packages/backend/src/server/api/endpoints/following/create.ts
@@ -6,6 +6,7 @@ import define from '../../define';
 import { ApiError } from '../../error';
 import { getUser } from '../../common/getters';
 import { Followings, Users } from '@/models/index';
+import { IdentifiableError } from '@/misc/identifiable-error';
 
 export const meta = {
 	tags: ['following', 'users'],
@@ -92,8 +93,10 @@ export default define(meta, async (ps, user) => {
 	try {
 		await create(follower, followee);
 	} catch (e) {
-		if (e.id === '710e8fb0-b8c3-4922-be49-d5d93d8e6a6e') throw new ApiError(meta.errors.blocking);
-		if (e.id === '3338392a-f764-498d-8855-db939dcf8c48') throw new ApiError(meta.errors.blocked);
+		if (e instanceof IdentifiableError) {
+			if (e.id === '710e8fb0-b8c3-4922-be49-d5d93d8e6a6e') throw new ApiError(meta.errors.blocking);
+			if (e.id === '3338392a-f764-498d-8855-db939dcf8c48') throw new ApiError(meta.errors.blocked);
+		}
 		throw e;
 	}
 
diff --git a/packages/backend/src/server/api/endpoints/following/requests/cancel.ts b/packages/backend/src/server/api/endpoints/following/requests/cancel.ts
index 19ed02c152..c9abbf36de 100644
--- a/packages/backend/src/server/api/endpoints/following/requests/cancel.ts
+++ b/packages/backend/src/server/api/endpoints/following/requests/cancel.ts
@@ -5,6 +5,7 @@ import define from '../../../define';
 import { ApiError } from '../../../error';
 import { getUser } from '../../../common/getters';
 import { Users } from '@/models/index';
+import { IdentifiableError } from '@/misc/identifiable-error';
 
 export const meta = {
 	tags: ['following', 'account'],
@@ -51,7 +52,9 @@ export default define(meta, async (ps, user) => {
 	try {
 		await cancelFollowRequest(followee, user);
 	} catch (e) {
-		if (e.id === '17447091-ce07-46dd-b331-c1fd4f15b1e7') throw new ApiError(meta.errors.followRequestNotFound);
+		if (e instanceof IdentifiableError) {
+			if (e.id === '17447091-ce07-46dd-b331-c1fd4f15b1e7') throw new ApiError(meta.errors.followRequestNotFound);
+		}
 		throw e;
 	}