diff --git a/packages/backend/src/server/api/endpoints/drive/folders/update.ts b/packages/backend/src/server/api/endpoints/drive/folders/update.ts
index 52b8b335b5..62b04e1df3 100644
--- a/packages/backend/src/server/api/endpoints/drive/folders/update.ts
+++ b/packages/backend/src/server/api/endpoints/drive/folders/update.ts
@@ -95,15 +95,14 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 					// Check if the circular reference will occur
 					const checkCircle = async (folderId: string): Promise<boolean> => {
-						// Fetch folder
-						const folder2 = await this.driveFoldersRepository.findOneBy({
+						const folder2 = await this.driveFoldersRepository.findOneByOrFail({
 							id: folderId,
 						});
 
-						if (folder2!.id === folder!.id) {
+						if (folder2.id === folder.id) {
 							return true;
-						} else if (folder2!.parentId) {
-							return await checkCircle(folder2!.parentId);
+						} else if (folder2.parentId) {
+							return await checkCircle(folder2.parentId);
 						} else {
 							return false;
 						}