未捕获的TypeError：无法读取null的属性“ split”

Question

尝试使用连接到我的智能合约的购买按钮时，出现错误“ Uncaught TypeError：无法读取null的属性'split'”。我正在重用另一个项目和开发人员的代码。有人可以建议我下一步的方向吗？

 function gPOAookie(name) {
        var dc = document.cookie;
        var prefix = name + "=";
        var begin = dc.indexOf("; " + prefix);

    console.log(prefix, begin); 

    if (begin == -1) {
            begin = dc.indexOf(prefix);

            console.log(prefix, begin);
            if (begin != 0) return null;

            console.log(prefix, begin);
        }
        else
        {
            begin += 2;
            var end = document.cookie.indexOf(";", begin);
            if (end == -1) {
            end = dc.length;

            console.log(begin, end);
        }
     }

     return decodeURI(dc.substring(begin + prefix.length, end));
}


function fund (address, amount) {

    console.log("funding :" + amount);

    //  alert(gPOAookie('masternode'));

    if (walletMode === 'metamask') {

        contract.buy(gPOAookie('masternode').split(';')[0], {

            value: convertEthToWei(amount)
        }, function (e, r) {
            console.log(e, r)
        })
    } else if (walletMode === 'web') {
         call(address, 'buy', [], convertEthToWei(amount))
    }
}

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