Why do I keep getting this error? Cannot read properties of undefined (reading ‘toString’)

I am working on a Yahtzee project and i am trying to put out a bonus of 35 points if the user passes 62 points but it wont seem to add into the total but i do get the alert of it saying “you get a bonus” but it just doesnt show on the actual page
The error im getting is
Uncaught TypeEroor: Cannon read properties of undefined (reading ‘toString’)
at nextRound (145)
at rollDice (99)
at HTMLButtonElement.onclick (347)


        let dice = [
            {'img': 'Die1.PNG', 'value': 1},
            {'img': 'Die2.PNG', 'value': 2},
            {'img': 'Die3.PNG', 'value': 3},
            {'img': 'Die4.PNG', 'value': 4},
            {'img': 'Die5.PNG', 'value': 5},
            {'img': 'Die6.PNG', 'value': 6}
        ]
        let userDice =[
            {'dice': 0, 'checked': false, 'id': "d1"},
            {'dice': 0, 'checked': false, 'id': "d2"},
            {'dice': 0, 'checked': false, 'id': "d3"},
            {'dice': 0, 'checked': false, 'id': "d4"},
            {'dice': 0, 'checked': false, 'id': "d5"},
        ]
        let scorecard = [
            {'num':1, 'value' :0, 'area' : "ace1"},
            {'num':2, 'value' :0, 'area' : "twos1"},
            {'num':3, 'value' :0, 'area' : "threes1"},
            {'num':4, 'value' :0, 'area' : "fours1"},
            {'num':5, 'value' :0, 'area' : "five1"},
            {'num':6, 'value' :0, 'area' : "sixes1"},
        ]
        var turns = 5;
        var rollsLeft = 3;
        var wins =0;
        var losses = 0;
        const WINPOINTS=200;
        function user(){
            //document.getElementById("name").innerHTML= prompt("Enter your name");
        }
        function rollDice() {
            if (rollsLeft > 0) {
                for (let i = 0; i < userDice.length; i++) {
                    if (userDice[i].checked == false)
                    {
                        let rDie = Math.floor(Math.random() * 6);
                        document.getElementById(userDice[i].id).innerHTML = `<img src ="imgs/${dice[rDie].img}" height='50px' width='50px'> `;
                         userDice[i].value = dice[rDie].value;
                    }
                }
                rollsLeft--;
                var display = document.getElementById("rollsLeft")
                display.innerHTML = rollsLeft;

            } else {
                nextRound();
                for(let j = 0; j < userDice.length; j++)
                {
                    userDice[j].checked = false;
                     //rollsLeft = 3;
                }
            }
        }
        function nextRound(){
            let keepDice = 0;
           let totalSum= 0;
           let roundSum = 0;
            let bonus = 35;
            if (turns > 0) {
                keepDice = prompt("What number do you wish to keep? ");
                for (let i = 0; i < userDice.length; i++) {
                    if (userDice[i].value == keepDice) {
                        roundSum += userDice[i].value
                    }
                }
                scorecard[keepDice - 1].value = roundSum;

                document.getElementById(scorecard[keepDice - 1].area).innerHTML = roundSum.toString();
            }
            else
                {
                    keepDice = prompt("What number do you wish to keep? ");
                    for (let i = 0; i < userDice.length; i++) {
                        if (userDice[i].value == keepDice) {
                            roundSum += userDice[i].value
                        }
                    }
                    scorecard[keepDice - 1].value = roundSum;

                    document.getElementById(scorecard[keepDice - 1].area).innerHTML = roundSum.toString();

                    for (let j = 0; j < userDice.length + 1; j++)
                    {
                        totalSum += scorecard[j].value;
                    }
                    document.getElementById("total1").innerHTML = totalSum.toString();

                    if (totalSum > 62)
                    {
                        totalSum += bonus;
                        alert("You get a bonus!!")
                        document.getElementById("bonus1").innerHTML.bonus.toString();
                        document.getElementById("total1").innerHTML = totalSum.toString();

                    }
                    else
                    {
                        document.getElementById("bonus1").innerHTML = "0";
                    }
                    alert("game over")
                }
            }

        // let wins = document.getElementById("wins");
        // let losses = document.getElementById("losses");
        // if(wins > WINPOINTS){
        //   wins++
        // }else {
        //   losses++
        // }

        $( document ).ready(function() {
            resetThings();
            console.log( "yo im ready!" );

            function resetThings(){
                rollDice();

            }

            $("#reset").click(function() {
                alert("reset this");
                rollsLeft=3;
                var display = document.getElementById("rollsLeft")
                display.innerHTML = rollsLeft;
                rollDice();
                $('input[type=checkbox]:checked').each(function(){
                    $(this).prop('checked', false);
                });
                $('input[type=checkbox]:checked').each(function(){
                    $(this).prop('value', 0);
                });
                turns--;
                document.getElementById("turnsLeft").innerHTML = `${turns}`;
            })

            $("#d1Check").click(function () {
                if (userDice[0].checked) {
                    userDice[0].checked = false;
                } else {
                    userDice[0].checked = true;
                }
            })
            $("#d2Check").click(function () {
                if (userDice[1].checked) {
                    userDice[1].checked = false;
                } else {
                    userDice[1].checked = true;
                }
            })
            $("#d3Check").click(function () {
                if (userDice[2].checked) {
                    userDice[2].checked = false;
                } else {
                    userDice[2].checked = true;
                }
            })
            $("#d4Check").click(function () {
                if (userDice[3].checked) {
                    userDice[3].checked = false;
                } else {
                    userDice[3].checked = true;
                }
            })
            $("#d5Check").click(function () {
                if (userDice[4].checked) {
                    userDice[4].checked = false;
                } else {
                    userDice[4].checked = true;
                }        })
        })
        body{
            background-color: #555555;
        }
        td {
            width: 30%;
            font-size: small;
        }
        .col-6{
            padding-bottom: 30px;
            padding-top: 25px;
            color: white;

        }
        .col-6 span{
            color: black;
            padding-right: 20px;
        }
        .resTable span{
            padding-left: 20px;
        }
        .resTable{
            border-style: solid;
            border-color: black;
            border-width: thin;
        }
        h1 {
            margin-bottom: -20px;
        }
        h1{
            font-family: Papyrus;
            font-size: 45px;
        }
        li a {
            margin-top: 40px;
            margin-left: 20px;
        }
<!doctype html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
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    </style>
    <script>
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     <title>Hello, world!</title>
</head>
<body onload="user()">
<div class ="container-fluid">
    <header class=" mb-4 border-bottom border-dark">
        <div class="row">
            <div class="col-5">
                <ul class="nav nav-pills">
                    <li class="nav-item">
                        <a href="https://usbrandcolors.com/apple-colors/" class="nav-link active link-dark bg-dark text-light">Color</a>
                    </li>
                </ul>
            </div>
            <div class="col-6">
                <h1><span>Dark</span><img src="imgs/543598.png" width="180"height="80"></h1>
            </div>
        </div>
    </header>
    <div class="row">
        <div class="col">
            <div class="col-9">
                PLAYERS NAME: <span id="name"></span>
            </div>
            <br>
            <br>
            <table class="resTable table-bordered">
                <tbody>
                <tr>
                    <th scope="row">Win points</th>
                    <td><span id="200">200</span></td>
                </tr>
                <tr>
                    <th scope="row">Wins</th>
                    <td><span id="wins">0</span></td>
                </tr>
                <tr>
                    <th scope="row">Losses</th>
                    <td><span id="losses">0</span></td>
                </tr>
                </tbody>
            </table>
        </div>
        <div class="col-4">
            <table class="table table-bordered border-dark border border-2 table-sm">
                <caption>* if total score is 62 or over <br>** of upper section</caption>
                <thead>
                <tr>
                    <th scope="col">UPPER <br>SECTION</th>
                    <th scope="col">HOW TO <br>SCORE</th>
                    <th scope="col">GAME <br>#1</th>
                </tr>
                </thead>
                <tbody>
                <tr>
                    <th scope="row">ACE <img src="imgs/Die1.PNG" width="40"height="38" > =1</th>
                    <td>Count and <br> add only <br>ACES</td>
                    <td><div id="ace1"></div></td>
                </tr>
                <tr>
                    <th scope="row">TWOS <img src="imgs/Die2.PNG" width="40"height="38" > =2</th>
                    <td>Count and <br> add only <br>TWOS</td>
                    <td><div id="twos1"></div></td>
                </tr>
                <tr>
                    <th scope="row">THREES <img src="imgs/Die3.PNG" width="40"height="38" > =3</th>
                    <td>Count and <br> add only <br>THREES</td>
                    <td><div id="threes1"></div></td>
                </tr>
                <tr>
                    <th scope="row">FOURS <img src="imgs/Die4.PNG" width="40"height="38" > =4</th>
                    <td>Count and <br> add only <br>FOURS</td>
                    <td><div id="fours1"></div></td>
                </tr>
                <tr>
                    <th scope="row">FIVES <img src="imgs/Die5.PNG" width="40"height="38" > =5</th>
                    <td>Count and <br> add only <br>FIVES</td>
                    <td><div id="five1"></div></td>
                </tr>
                <tr>
                    <th scope="row">SIXES <img src="imgs/Die6.PNG" width="40"height="38" > =6</th>
                    <td>Count and <br> add only <br>SIXES</td>
                    <td><div id="sixes1"></div></td>
                </tr>
                <tr>
                    <th scope="row">3 of a kind</th>
                    <td>Add total <br> of all dice</td>
                    <td></td>
                </tr>
                <tr>
                    <th scope="row">4 of a kind</th>
                    <td>Add total <br> of all dice</td>
                    <td></td>
                </tr>
                <tr>
                    <th scope="row">FULL HOUSE</th>
                    <td>Score 25</td>
                    <td></td>
                </tr>
                <tr>
                    <th scope="row"><b>TOTAL SCORE</b></th>
                    <td> <img src="imgs/arrow.png" width="60" height="30"></td>
                    <td></td>
                </tr>
                <tr>
                    <th scope="row"><b>BONUS*</b></th>
                    <td>Add total <br> of all dice</td>
                    <td><div id="bonus1"></div></td>
                </tr>
                <tr>
                    <th scope="row"><b>TOTAL**</b></th>
                    <td> <img src="imgs/arrow.png" width="60" height="30"> </td>
                    <td><div id="total1"></div></td>
                </tr>

                </tbody>
            </table>
        </div>
        <div class="col-4">
            <h3>Your Dice</h3>
            <form id="shuffle">
                <button type="button" class="btn btn-dark" id="rollBtn" onclick="rollDice();">Roll</button>
                <button type="button" class="btn btn-dark" id="reset">Reset</button>
                <p>Rolls left: <span id="rollsLeft">2</span>  Turns Left:<span id="turnsLeft">5</span></p>
            </form>
            <table class="table table-borderless table-sm table-hover ">
                <tr> <td> Save: <input type="checkbox" name='diceCheck' id="d1Check" /> </input> </td>
                    <td id="d1"> <img src="imgs/Die1.PNG" height="50" width="50"> </td>
                </tr>
                <tr>  <td> Save: <input type="checkbox" name="diceCheck" id="d2Check" /> </input> </td>
                    <td id="d2"><img src="imgs/Die2.PNG" height="50" width="50"> </td>
                </tr>
                <tr> <td> Save: <input type="checkbox" name="diceCheck" id="d3Check"/> </input> </td>
                    <td id="d3"> <img src="imgs/Die3.PNG" height="50" width="50"></td>
                </tr>
                <tr> <td> Save: <input type="checkbox" name="diceCheck" id="d4Check"/> </input> </td>
                    <td id="d4"> <img src="imgs/Die4.PNG" height="50" width="50"></td>
                </tr>
                <tr> <td> Save: <input type="checkbox" name="diceCheck" id="d5Check"/> </input> </td>
                    <td id="d5"> <img src="imgs/Die5.PNG" height="50" width="50"></td>
                </tr>
            </table>
            <br>
            <br>
        </div>
    </div>
</div>
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