From 25770647e64273de2b87a57b8599aaf6ae5f7a5f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=B7=AF=E6=8C=AF=E5=87=AF?= <l>
Date: Mon, 3 Nov 2025 22:15:55 +0800
Subject: [PATCH] fix: add bounds check to getColumnWidth function

---
 src/VirtualTable/VirtualCell.tsx | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/VirtualTable/VirtualCell.tsx b/src/VirtualTable/VirtualCell.tsx
index ebcfff4ad..0b2d2d896 100644
--- a/src/VirtualTable/VirtualCell.tsx
+++ b/src/VirtualTable/VirtualCell.tsx
@@ -31,9 +31,15 @@ export interface VirtualCellProps<RecordType> {
  * Return the width of the column by `colSpan`.
  * When `colSpan` is `0` will be trade as `1`.
  */
-export function getColumnWidth(colIndex: number, colSpan: number, columnsOffset: number[]) {
+export function getColumnWidth(colIndex: number, colSpan: number, columnsOffset: number[]): number {
   const mergedColSpan = colSpan || 1;
-  return columnsOffset[colIndex + mergedColSpan] - (columnsOffset[colIndex] || 0);
+
+  const startIndex = Math.max(colIndex, 0);
+  const endIndex = Math.min(startIndex + mergedColSpan, columnsOffset.length - 1);
+
+  const startOffset = columnsOffset[startIndex] || 0;
+  const endOffset = columnsOffset[endIndex] || startOffset;
+  return Math.max(endOffset - startOffset, 0);
 }
 
 const VirtualCell = <RecordType,>(props: VirtualCellProps<RecordType>) => {