diff --git a/api/errors/errors.go b/api/errors/errors.go
index 5c807b1..d9c0958 100644
--- a/api/errors/errors.go
+++ b/api/errors/errors.go
@@ -122,6 +122,7 @@ const (
 	ErrInvalidBucketObjectLockConfiguration
 	ErrObjectLockConfigurationNotFound
 	ErrObjectLockConfigurationNotAllowed
+	ErrObjectLockConfigurationVersioningCannotBeChanged
 	ErrNoSuchObjectLockConfiguration
 	ErrObjectLocked
 	ErrInvalidRetentionDate
@@ -831,6 +832,12 @@ var errorCodes = errorCodeMap{
 		Description:    "Object Lock configuration cannot be enabled on existing buckets",
 		HTTPStatusCode: http.StatusConflict,
 	},
+	ErrObjectLockConfigurationVersioningCannotBeChanged: {
+		ErrCode:        ErrObjectLockConfigurationVersioningCannotBeChanged,
+		Code:           "InvalidBucketState",
+		Description:    "An Object Lock configuration is present on this bucket, so the versioning state cannot be changed.",
+		HTTPStatusCode: http.StatusConflict,
+	},
 	ErrNoSuchCORSConfiguration: {
 		ErrCode:        ErrNoSuchCORSConfiguration,
 		Code:           "NoSuchCORSConfiguration",
diff --git a/api/handler/locking.go b/api/handler/locking.go
index 0bcff7a..605e60a 100644
--- a/api/handler/locking.go
+++ b/api/handler/locking.go
@@ -56,11 +56,13 @@ func (h *handler) PutBucketObjectLockConfigHandler(w http.ResponseWriter, r *htt
 		return
 	}
 
-	settings.LockConfiguration = lockingConf
+	// settings pointer is stored in the cache, so modify a copy of the settings
+	newSettings := *settings
+	newSettings.LockConfiguration = lockingConf
 
 	sp := &layer.PutSettingsParams{
 		BktInfo:  bktInfo,
-		Settings: settings,
+		Settings: &newSettings,
 	}
 
 	if err = h.obj.PutBucketSettings(r.Context(), sp); err != nil {
diff --git a/api/handler/versioning.go b/api/handler/versioning.go
index e4da703..8d03480 100644
--- a/api/handler/versioning.go
+++ b/api/handler/versioning.go
@@ -2,7 +2,6 @@ package handler
 
 import (
 	"encoding/xml"
-	"fmt"
 	"net/http"
 
 	"github.com/nspcc-dev/neofs-s3-gw/api"
@@ -37,15 +36,18 @@ func (h *handler) PutBucketVersioningHandler(w http.ResponseWriter, r *http.Requ
 		h.logAndSendError(w, "invalid versioning configuration", reqInfo, errors.GetAPIError(errors.ErrMalformedXML))
 		return
 	}
-	settings.Versioning = configuration.Status
+
+	// settings pointer is stored in the cache, so modify a copy of the settings
+	newSettings := *settings
+	newSettings.Versioning = configuration.Status
 
 	p := &layer.PutSettingsParams{
 		BktInfo:  bktInfo,
-		Settings: settings,
+		Settings: &newSettings,
 	}
 
 	if p.Settings.VersioningSuspended() && bktInfo.ObjectLockEnabled {
-		h.logAndSendError(w, "couldn't suspend bucket versioning", reqInfo, fmt.Errorf("object lock is enabled"))
+		h.logAndSendError(w, "couldn't suspend bucket versioning", reqInfo, errors.GetAPIError(errors.ErrObjectLockConfigurationVersioningCannotBeChanged))
 		return
 	}