diff --git a/backend/services/controller/internal/db/db.go b/backend/services/controller/internal/db/db.go
index 8f3271f..5769fc5 100644
--- a/backend/services/controller/internal/db/db.go
+++ b/backend/services/controller/internal/db/db.go
@@ -3,6 +3,7 @@ package db
 import (
 	"context"
 	"log"
+	"sync"
 
 	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/mongo"
@@ -16,6 +17,7 @@ type Database struct {
 	devices *mongo.Collection
 	users   *mongo.Collection
 	ctx     context.Context
+	m       *sync.Mutex
 }
 
 func NewDatabase(ctx context.Context, mongoUri string) Database {
@@ -43,6 +45,8 @@ func NewDatabase(ctx context.Context, mongoUri string) Database {
 	db.devices = devices
 	db.users = users
 	db.ctx = ctx
+	db.m = &sync.Mutex{}
+
 	return db
 }
 
diff --git a/backend/services/controller/internal/db/device.go b/backend/services/controller/internal/db/device.go
index 5ccbae5..eeba31e 100644
--- a/backend/services/controller/internal/db/device.go
+++ b/backend/services/controller/internal/db/device.go
@@ -43,6 +43,9 @@ func (d *Database) CreateDevice(device Device) error {
 	var result bson.M
 	var deviceExistent Device
 
+	d.m.Lock()
+	defer d.m.Unlock()
+
 	/* ------------------ Do not overwrite status of other mtp ------------------ */
 	err := d.devices.FindOne(d.ctx, bson.D{{"sn", device.SN}}, nil).Decode(&deviceExistent)
 	if err == nil {
diff --git a/backend/services/controller/internal/db/status.go b/backend/services/controller/internal/db/status.go
index 4087e66..cff6bdf 100644
--- a/backend/services/controller/internal/db/status.go
+++ b/backend/services/controller/internal/db/status.go
@@ -11,6 +11,8 @@ import (
 func (d *Database) UpdateStatus(sn string, status Status, mtp MTP) error {
 	var result Device
 
+	d.m.Lock()
+	defer d.m.Unlock()
 	err := d.devices.FindOne(d.ctx, bson.D{{"sn", sn}}, nil).Decode(&result)
 	if err != nil {
 		log.Println(err)