diff --git a/internal/controllers/webhook.go b/internal/controllers/webhook.go
index 29b88ae..c88ad83 100644
--- a/internal/controllers/webhook.go
+++ b/internal/controllers/webhook.go
@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"github.com/gofiber/fiber/v2"
 	"go.uber.org/zap"
-	"net/http"
 	"strconv"
 )
 
@@ -20,7 +19,11 @@ func (c *WebhookController) WebhookCreate(ctx *fiber.Ctx) error {
 	noAccess := ctx.Query("error")
 
 	if noAccess != "" {
-		return ctx.Status(http.StatusForbidden).SendString("Access denied")
+		return ctx.Status(fiber.StatusForbidden).SendString("Access denied")
+	}
+
+	if state == "" {
+		return ctx.Status(fiber.StatusBadRequest).SendString("State don't be empty")
 	}
 
 	accountID, _, err := tools.DeserializeProtobufMessage(state)
diff --git a/pkg/amoClient/amo.go b/pkg/amoClient/amo.go
index c85c31a..1bd4d60 100644
--- a/pkg/amoClient/amo.go
+++ b/pkg/amoClient/amo.go
@@ -7,7 +7,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"net/http"
 	"net/url"
 	"os"
 	"penahub.gitlab.yandexcloud.net/backend/quiz/common.git/model"
@@ -694,14 +693,14 @@ func (a *Amo) createPart(uploadData models.UploadSession, file *os.File) (*model
 			return nil, fmt.Errorf("request failed: %v", errs[0])
 		}
 
-		if statusCode != http.StatusOK && statusCode != http.StatusAccepted {
+		if statusCode != fiber.StatusOK && statusCode != fiber.StatusAccepted {
 			return nil, fmt.Errorf("failed to upload part file to amo, status: %d, respBody: %s", statusCode, string(resBody))
 		}
 
 		start = end
 		remainingSize -= partSize
 
-		if statusCode == http.StatusAccepted {
+		if statusCode == fiber.StatusAccepted {
 			var next struct {
 				NextUrl   string `json:"next_url"`
 				SessionID int    `json:"session_id"`
diff --git a/pkg/pena-social-auth/client.go b/pkg/pena-social-auth/client.go
index 0b64148..3f03863 100644
--- a/pkg/pena-social-auth/client.go
+++ b/pkg/pena-social-auth/client.go
@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"github.com/gofiber/fiber/v2"
 	"go.uber.org/zap"
-	"net/http"
 )
 
 type Deps struct {
@@ -49,7 +48,7 @@ func (c *Client) GenerateAmocrmAuthURL(accountID string) (string, error) {
 		return "", fmt.Errorf("request GenerateAmocrmAuthURL failed: %v", errs[0])
 	}
 
-	if statusCode != http.StatusOK {
+	if statusCode != fiber.StatusOK {
 		errorMessage := fmt.Sprintf("received an incorrect response from GenerateAmocrmAuthURL: %d", statusCode)
 		c.logger.Error(errorMessage, zap.Int("status", statusCode))
 		return "", fmt.Errorf(errorMessage)