From 68a3f871ebfd6bcd5baca1c157be5e7224185ba3 Mon Sep 17 00:00:00 2001
From: Zbyszek Czarnecki <klucznik@produktiva.net>
Date: Wed, 29 Jul 2026 20:26:19 +0200
Subject: [PATCH] Fix getTreeFromFlatData regression with null rootKey

---
 src/utils/tree-data-utils.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/utils/tree-data-utils.ts b/src/utils/tree-data-utils.ts
index cb245817..6f7aa46b 100644
--- a/src/utils/tree-data-utils.ts
+++ b/src/utils/tree-data-utils.ts
@@ -991,7 +991,7 @@ export const getTreeFromFlatData = <T extends Record<string, unknown>>({
     getParentKey(child)
   )
 
-  if (rootKey === null || !childrenToParents[rootKey]) {
+  if (!(String(rootKey) in childrenToParents)) {
     return []
   }