From 61ee083d0e62b40e5b23b1289f34176ab0a6c4ee Mon Sep 17 00:00:00 2001
From: Andrey Sobolev <haiodo@users.noreply.github.com>
Date: Tue, 22 Mar 2022 16:10:47 +0700
Subject: [PATCH] Fix exception in #1186 (#1191)

Signed-off-by: Andrey Sobolev <haiodo@gmail.com>
---
 packages/core/src/hierarchy.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/core/src/hierarchy.ts b/packages/core/src/hierarchy.ts
index d99c807ff9..96f32a8edc 100644
--- a/packages/core/src/hierarchy.ts
+++ b/packages/core/src/hierarchy.ts
@@ -357,7 +357,7 @@ export class Hierarchy {
           }
         }
       }
-      for (const [k, v] of Object.entries(lu)) {
+      for (const [k, v] of Object.entries(lu ?? {})) {
         if (k === '_id') {
           continue
         }