From 3210c304fe32bc842c4bd23b76a7360f86ea2664 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20Lyngs=C3=B8?= <nsl@umbraco.dk>
Date: Fri, 11 Apr 2025 10:33:21 +0200
Subject: [PATCH] fix appending to a froozen object (#19003)

---
 .../src/packages/rte/components/rte-base.element.ts         | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Umbraco.Web.UI.Client/src/packages/rte/components/rte-base.element.ts b/src/Umbraco.Web.UI.Client/src/packages/rte/components/rte-base.element.ts
index fcf6be124e..801b55bbd9 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/rte/components/rte-base.element.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/rte/components/rte-base.element.ts
@@ -53,7 +53,11 @@ export abstract class UmbPropertyEditorUiRteElementBase
 
 		const buildUpValue: Partial<UmbPropertyEditorRteValueType> = value ? { ...value } : {};
 		buildUpValue.markup ??= '';
-		buildUpValue.blocks ??= { layout: {}, contentData: [], settingsData: [], expose: [] };
+		if (buildUpValue.blocks) {
+			buildUpValue.blocks = { ...buildUpValue.blocks };
+		} else {
+			buildUpValue.blocks ??= { layout: {}, contentData: [], settingsData: [], expose: [] };
+		}
 		buildUpValue.blocks.layout ??= {};
 		buildUpValue.blocks.contentData ??= [];
 		buildUpValue.blocks.settingsData ??= [];