diff --git a/src/controllers/01-branch-controller.ts b/src/controllers/01-branch-controller.ts
index adf928d..da0690f 100644
--- a/src/controllers/01-branch-controller.ts
+++ b/src/controllers/01-branch-controller.ts
@@ -26,7 +26,7 @@ import {
 } from "../services/permission";
 import { filterStatus } from "../services/prisma";
 import { connectOrDisconnect, connectOrNot } from "../utils/relation";
-import { throwNotFound } from "../utils/error";
+import { notFoundError } from "../utils/error";
 
 if (!process.env.MINIO_BUCKET) {
   throw Error("Require MinIO bucket.");
@@ -298,7 +298,7 @@ export class BranchController extends Controller {
       where: { id: branchId },
     });
 
-    if (!record) return throwNotFound("Branch");
+    if (!record) throw notFoundError("Branch");
 
     return record;
   }
@@ -540,7 +540,7 @@ export class BranchController extends Controller {
       where: { id: branchId },
     });
 
-    if (!record) return throwNotFound("Branch");
+    if (!record) throw notFoundError("Branch");
 
     await permissionCheck(req.user, record);
 
@@ -589,7 +589,7 @@ export class BranchFileController extends Controller {
       include: branchRelationPermInclude(user),
       where: { id },
     });
-    if (!data) return throwNotFound("Branch");
+    if (!data) throw notFoundError("Branch");
     await permissionCheck(user, data);
   }
 
diff --git a/src/controllers/03-employee-controller.ts b/src/controllers/03-employee-controller.ts
index 9a57772..e70a98c 100644
--- a/src/controllers/03-employee-controller.ts
+++ b/src/controllers/03-employee-controller.ts
@@ -25,7 +25,7 @@ import {
   createPermCondition,
 } from "../services/permission";
 import { connectOrDisconnect, connectOrNot } from "../utils/relation";
-import { throwNotFound, throwRelationError } from "../utils/error";
+import { notFoundError, relationError } from "../utils/error";
 import { deleteFile, fileLocation, getFile, listFile, setFile } from "../utils/minio";
 
 if (!process.env.MINIO_BUCKET) {
@@ -357,7 +357,7 @@ export class EmployeeController extends Controller {
       where: { id: employeeId },
     });
 
-    if (!record) return throwNotFound("Employee");
+    if (!record) throw notFoundError("Employee");
 
     return record;
   }
@@ -382,10 +382,10 @@ export class EmployeeController extends Controller {
         },
       }),
     ]);
-    if (body.provinceId !== province?.id) return throwRelationError("Province");
-    if (body.districtId !== district?.id) return throwRelationError("District");
-    if (body.subDistrictId !== subDistrict?.id) return throwRelationError("Sub-district");
-    if (!customerBranch) return throwRelationError("Customer Branch");
+    if (body.provinceId !== province?.id) throw relationError("Province");
+    if (body.districtId !== district?.id) throw relationError("District");
+    if (body.subDistrictId !== subDistrict?.id) throw relationError("Sub-district");
+    if (!customerBranch) throw relationError("Customer Branch");
 
     await permissionCheck(req.user, customerBranch.customer.registeredBranch);
 
@@ -541,10 +541,10 @@ export class EmployeeController extends Controller {
       }),
     ]);
 
-    if (body.provinceId && !province) return throwRelationError("Province");
-    if (body.districtId && !district) return throwRelationError("District");
-    if (body.subDistrictId && !subDistrict) return throwRelationError("SubDistrict");
-    if (body.customerBranchId && !customerBranch) return throwRelationError("Customer");
+    if (body.provinceId && !province) throw relationError("Province");
+    if (body.districtId && !district) throw relationError("District");
+    if (body.subDistrictId && !subDistrict) throw relationError("SubDistrict");
+    if (body.customerBranchId && !customerBranch) throw relationError("Customer");
     if (!employee) {
       throw new HttpError(HttpStatus.NOT_FOUND, "Employee cannot be found.", "employeeNotFound");
     }
@@ -735,7 +735,7 @@ export class EmployeeController extends Controller {
       },
     });
 
-    if (!record) return throwNotFound("Employee");
+    if (!record) throw notFoundError("Employee");
 
     await permissionCheck(req.user, record.customerBranch.customer.registeredBranch);
 
@@ -783,7 +783,7 @@ export class EmployeeFileController extends Controller {
         },
       },
     });
-    if (!data) return throwNotFound("Employee");
+    if (!data) throw notFoundError("Employee");
     await permissionCheck(user, data.customerBranch.customer.registeredBranch);
   }
 
diff --git a/src/controllers/04-service-controller.ts b/src/controllers/04-service-controller.ts
index 4b0d68a..d284e7c 100644
--- a/src/controllers/04-service-controller.ts
+++ b/src/controllers/04-service-controller.ts
@@ -25,7 +25,7 @@ import {
   createPermCondition,
 } from "../services/permission";
 import { filterStatus } from "../services/prisma";
-import { throwRelationError } from "../utils/error";
+import { relationError } from "../utils/error";
 import { deleteFile, fileLocation, getFile, listFile, setFile } from "../utils/minio";
 
 const MANAGE_ROLES = [
@@ -253,7 +253,7 @@ export class ServiceController extends Controller {
       }),
     ]);
 
-    if (!productGroup) return throwRelationError("Product Type");
+    if (!productGroup) throw relationError("Product Type");
 
     await permissionCheck(req.user, productGroup.registeredBranch);
 
diff --git a/src/utils/error.ts b/src/utils/error.ts
index ec62f5b..614fff3 100644
--- a/src/utils/error.ts
+++ b/src/utils/error.ts
@@ -1,16 +1,16 @@
 import HttpError from "../interfaces/http-error";
 import HttpStatus from "../interfaces/http-status";
 
-export function throwRelationError(name: string) {
-  throw new HttpError(
+export function relationError(name: string) {
+  return new HttpError(
     HttpStatus.BAD_REQUEST,
     `${name} cannot be found.`,
     `relation${name.replaceAll(" ", "")}NotFound`,
   );
 }
 
-export function throwNotFound(name: string) {
-  throw new HttpError(
+export function notFoundError(name: string) {
+  return new HttpError(
     HttpStatus.BAD_REQUEST,
     `${name} cannot be found.`,
     `${name.charAt(0).toLowerCase() + name.replaceAll(" ", "").slice(1)}NotFound`,