diff --git a/pkg/services/tree/signature.go b/pkg/services/tree/signature.go
index 80f5b359..b0f00615 100644
--- a/pkg/services/tree/signature.go
+++ b/pkg/services/tree/signature.go
@@ -9,6 +9,7 @@ import (
 	"fmt"
 
 	core "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
+	checkercore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/common/ape"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/api/refs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
@@ -70,6 +71,12 @@ func (s *Service) verifyClient(ctx context.Context, req message, cid cidSDK.ID,
 }
 
 func apeErr(err error) error {
+	var chRouterErr *checkercore.ChainRouterError
+	if !errors.As(err, &chRouterErr) {
+		errServerInternal := &apistatus.ServerInternal{}
+		apistatus.WriteInternalServerErr(errServerInternal, err)
+		return errServerInternal
+	}
 	errAccessDenied := &apistatus.ObjectAccessDenied{}
 	errAccessDenied.WriteReason(err.Error())
 	return errAccessDenied