moveRow script error

[jalim12]

An error occurs when running the code below. Please tell me the solution. (This is the code to move the selected row down.)

1. Add 2 rows
2. Add a row by checking 2 rows (added below the check row)
3. Error when moving down

아래 코드 실행 시 오류발생합니다. 해결방안을 알려주세요. 선택한 행을 아래로 이동하는 코드입니다.

1. 행 2개를 추가
2. 행 2개 check하여 행 추가 (check행 하위에 추가됨)
3. 아래로 이동 시 에러

version: 4.21.3

const checkedRowKeys = grid.getCheckedRowKeys();
if (checkedRowKeys == null || checkedRowKeys.length == 0) return;

const reversed = [...checkedRowKeys].reverse();
reversed.forEach((rowKey, index, array) => {
    const rowIndex = grid.getIndexOfRow(rowKey);
    const afterRow = grid.getRowAt(rowIndex+1);
    if(!afterRow || array.includes(afterRow.rowKey)) return;

    grid.moveRow(rowKey, rowIndex + 1);   // error!
});

script console error: Uncaught TypeError: Cannot convert undefined or null to object at Function.keys () at _loop_1 (utils.js:69:8) at Object.fitRowHeightWhenMovingRow (utils.js:69:8) at Object.moveRow (input.js:21:3) at Grid.dispatch (utils.js:69:8) at Grid.moveRow (utils.js:69:8)

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[stale[bot]]

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