diff --git a/src/controllers/expenses.controller.js b/src/controllers/expenses.controller.js
index 4296639d..8712c666 100644
--- a/src/controllers/expenses.controller.js
+++ b/src/controllers/expenses.controller.js
@@ -26,6 +26,7 @@ const create = async(req, res) => {
     || typeof spentAt !== 'string'
     || !title
     || !amount
+    // || typeof category !== 'string'
     || !user
   ) {
     return res.sendStatus(400);
@@ -45,12 +46,13 @@ const create = async(req, res) => {
 
 const getOne = async(req, res) => {
   const id = parseInt(req.params.id);
-  const product = await expensesService.getOne(id);
 
   if (typeof id !== 'number' || !id) {
     return res.sendStatus(400);
   }
 
+  const product = await expensesService.getOne(id);
+
   if (!product) {
     return res.sendStatus(404);
   }
@@ -60,6 +62,11 @@ const getOne = async(req, res) => {
 
 const remove = async(req, res) => {
   const id = parseInt(req.params.id);
+
+  if (typeof id !== 'number' || !id) {
+    return res.sendStatus(400);
+  }
+
   const product = await expensesService.getOne(id);
 
   if (!product) {
@@ -74,6 +81,11 @@ const remove = async(req, res) => {
 const update = async(req, res) => {
   const id = parseInt(req.params.id);
   const { ...args } = req.body;
+
+  if (typeof id !== 'number' || !id) {
+    return res.sendStatus(400);
+  }
+
   const product = await expensesService.getOne(id);
 
   if (!product) {
diff --git a/src/controllers/user.controller.js b/src/controllers/user.controller.js
index a93d52b6..3729e795 100644
--- a/src/controllers/user.controller.js
+++ b/src/controllers/user.controller.js
@@ -20,6 +20,11 @@ const create = async(req, res) => {
 
 const getOne = async(req, res) => {
   const id = parseInt(req.params.id);
+
+  if (typeof id !== 'number' || !id) {
+    return res.sendStatus(400);
+  }
+
   const neededUser = await userService.getOne(id);
 
   if (!neededUser) {
@@ -31,6 +36,11 @@ const getOne = async(req, res) => {
 
 const remove = async(req, res) => {
   const id = parseInt(req.params.id);
+
+  if (typeof id !== 'number' || !id) {
+    return res.sendStatus(400);
+  }
+
   const user = await userService.getOne(id);
 
   if (!user) {
@@ -45,12 +55,18 @@ const remove = async(req, res) => {
 const update = async(req, res) => {
   const id = parseInt(req.params.id);
   const { name } = req.body;
-  const user = await userService.getOne(id);
 
-  if (typeof name !== 'string' || !name.length) {
+  if (
+    typeof name !== 'string'
+    || typeof id !== 'number'
+    || !name.length
+    || !id
+  ) {
     return res.sendStatus(400);
   }
 
+  const user = await userService.getOne(id);
+
   if (!user) {
     return res.sendStatus(404);
   }
diff --git a/src/services/expenses.service.js b/src/services/expenses.service.js
index 082d8336..fc970456 100644
--- a/src/services/expenses.service.js
+++ b/src/services/expenses.service.js
@@ -14,7 +14,7 @@ const create = async(
   category = 'uncategorized',
   note = null,
 ) => {
-  const expense = await Expense.create({
+  return Expense.create({
     userId,
     spentAt,
     title,
@@ -22,8 +22,6 @@ const create = async(
     category,
     note,
   });
-
-  return expense;
 };
 
 const update = async(id, args) => {
diff --git a/src/services/user.service.js b/src/services/user.service.js
index 85536bc2..ca6c2d80 100644
--- a/src/services/user.service.js
+++ b/src/services/user.service.js
@@ -7,11 +7,9 @@ const getAll = async() => User.findAll();
 const remove = async(id) => User.destroy({ where: { id } });
 
 const create = async(name) => {
-  const user = await User.create({
+  return User.create({
     name,
   });
-
-  return user;
 };
 
 const update = (id, name) => {