diff --git a/pkg/services/object/common/target/target.go b/pkg/services/object/common/target/target.go
index a2d6b4d39..9e0f49297 100644
--- a/pkg/services/object/common/target/target.go
+++ b/pkg/services/object/common/target/target.go
@@ -86,7 +86,7 @@ func newTrustedTarget(prm *objectwriter.Params) (transformer.ChunkedObjectWriter
 		user.IDFromKey(&ownerSession, key.PublicKey)
 
 		if !ownerObj.Equals(ownerSession) {
-			return nil, errors.New("session token is missing but object owner id is different from the default key")
+			return nil, fmt.Errorf("session token is missing but object owner id (%s) is different from the default key (%s)", ownerObj, ownerSession)
 		}
 	} else {
 		if !ownerObj.Equals(sessionInfo.Owner) {