From da15ef2841076f40d2b278cdaedc47e45fde32ec Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <293473+sandersn@users.noreply.github.com>
Date: Wed, 30 Oct 2024 15:36:19 -0700
Subject: [PATCH] Fix a crash in an anonymous buffer that copilot is writing
 to. (#60377)

---
 src/server/scriptVersionCache.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/server/scriptVersionCache.ts b/src/server/scriptVersionCache.ts
index 55a957928a1..1a0c8713db2 100644
--- a/src/server/scriptVersionCache.ts
+++ b/src/server/scriptVersionCache.ts
@@ -632,6 +632,7 @@ export class LineNode implements LineCollection {
 
     walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void {
         // assume (rangeStart < this.totalChars) && (rangeLength <= this.totalChars)
+        if (this.children.length === 0) return;
         let childIndex = 0;
         let childCharCount = this.children[childIndex].charCount();
         // find sub-tree containing start