From 8da7d1794ba0c5bf7291c98ade6adfbc24af87d2 Mon Sep 17 00:00:00 2001
From: Maribeth Moffatt <maribethb@google.com>
Date: Tue, 16 Sep 2025 09:01:51 -0700
Subject: [PATCH] fix: account for undefined first sibling (#9368)

---
 core/block_svg.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/block_svg.ts b/core/block_svg.ts
index 295b80696..a22af525c 100644
--- a/core/block_svg.ts
+++ b/core/block_svg.ts
@@ -269,7 +269,7 @@ export class BlockSvg
       const firstSibling: BlockSvg = surroundParent.getChildren(false)[0];
       const siblings: BlockSvg[] = [firstSibling];
       let nextSibling: BlockSvg | null = firstSibling;
-      while ((nextSibling = nextSibling.getNextBlock())) {
+      while ((nextSibling = nextSibling?.getNextBlock())) {
         siblings.push(nextSibling);
       }
       return siblings;