From 627de5c8d322621d67839f8bed3f52596fd3f6c0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tim=20van=20den=20=F0=9F=94=9A?=
 <TimvdEijnden@users.noreply.github.com>
Date: Tue, 15 Jul 2025 14:11:32 +0200
Subject: [PATCH] fix: can't access property "size", store._customProperties is
 undefined

---
 packages/pinia/src/devtools/formatting.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/pinia/src/devtools/formatting.ts b/packages/pinia/src/devtools/formatting.ts
index 4bebe303db..8c26e9a31e 100644
--- a/packages/pinia/src/devtools/formatting.ts
+++ b/packages/pinia/src/devtools/formatting.ts
@@ -159,7 +159,7 @@ export function formatStoreForInspectorState(
     }))
   }
 
-  if (store._customProperties.size) {
+  if (store._customProperties && store._customProperties.size) {
     state.customProperties = Array.from(store._customProperties).map((key) => ({
       editable: true,
       key,