diff --git a/dev/.vscode-example/launch.json b/dev/.vscode-example/launch.json
index 6aedde85e..990fd42a8 100644
--- a/dev/.vscode-example/launch.json
+++ b/dev/.vscode-example/launch.json
@@ -250,4 +250,4 @@
             "stopAll": true
           }
     ]
-}
\ No newline at end of file
+}
diff --git a/docs/authentication.md b/docs/authentication.md
index 544839b2c..3fe5ca512 100644
--- a/docs/authentication.md
+++ b/docs/authentication.md
@@ -67,4 +67,4 @@ Bearer token is generally used for access control but can also affect authentica
 
 ## FrostFS ID
 
-## APE
\ No newline at end of file
+## APE
diff --git a/docs/images/authentication/authoverview.puml b/docs/images/authentication/authoverview.puml
index 1242fdfc6..20cac9f52 100644
--- a/docs/images/authentication/authoverview.puml
+++ b/docs/images/authentication/authoverview.puml
@@ -5,7 +5,7 @@ AddElementTag("smart-contract", $bgColor=#0abab5)
 
 Person(user, "User", "User with private key")
 
-Container_Boundary(stor, "FrostFS Storage") {	
+Container_Boundary(stor, "FrostFS Storage") {
 	Component(verify, "Sign Service", $descr="Check request signature")
 	Component(apesvc, "APE Service")
 	Component(objsvc, "Object service")
@@ -25,4 +25,4 @@ Rel("NeoGo",  ffsid, "Fetch users")
 Rel("NeoGo",  policy, "Fetch policies")
 
 SHOW_LEGEND(true)
-@enduml
\ No newline at end of file
+@enduml
diff --git a/pkg/services/tree/ape.go b/pkg/services/tree/ape.go
index f58721509..76ec254f0 100644
--- a/pkg/services/tree/ape.go
+++ b/pkg/services/tree/ape.go
@@ -19,9 +19,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 )
 
-var (
-	subjectNotFoundErrorMessage = "subject not found"
-)
+var subjectNotFoundErrorMessage = "subject not found"
 
 func (s *Service) checkAPE(container *core.Container, cid cid.ID, operation acl.Op, role acl.Role, publicKey *keys.PublicKey) error {
 	namespace := ""