未处理的拒绝SequelizeDatabaseError：'field list'中的未知列'NaN'

我试图通过sequelize更新表 . 但我收到错误 - Unhandled rejection SequelizeDatabaseError: Unknown column 'NaN' in 'field list' . 我的代码是

db.billingplan.findById(req.params.id).then(result=>{
            result.update({
                'poregisterReference': String(req.body.reference),
                'po_number' : req.body.po_number,
                'billing_milestone': String(req.body.billing_milestone),
                'billing_milestone_probable_date':checkDate(req.body.billing_milestone_probable_date),
                'milestone_blling_amount':req.body.milestone_billing_amount,
                'actual_billing_date': actual_billing_date,
                'bill_number':req.body.bill_number,
                'bill_amount':bill_amount,
                'tax_rate':tax_rate,
                'tds_rate':tds_rate,
                'recovery_date': recovery_date,
                'recovery_amount':recovery_amount ,
                'utr_number': String(req.body.utr_number),
                'bill_amount_with_tax': bill_amount_with_tax,
                'net_recoverable_after_tds': net_recoverable_after_tds ,
                'short_recovery': recovery_amount - net_recoverable_after_tds,
                'recovery_period': dayDiff(recovery_date, actual_billing_date )
            });
        });

我用这种方式更新而不使用where子句但从来没有遇到过这个问题，所以我猜这不是问题所在 . 有人能告诉我这里我做错了什么 . follwing是堆栈跟踪：

Unhandled rejection SequelizeDatabaseError: Unknown column 'NaN' in 'field list'
    at Query.formatError (D:\Users\Temp\Desktop\POregister\node_modules\sequelize\lib\dialects\mysql\query.js:228:16)
    at Query.connection.query [as onResult] (D:\Users\Temp\Desktop\POregister\node_modules\sequelize\lib\dialects\mysql\query.js:55:23)
    at Query.Command.execute (D:\Users\Temp\Desktop\POregister\node_modules\mysql2\lib\commands\command.js:30:12)
    at Connection.handlePacket (D:\Users\Temp\Desktop\POregister\node_modules\mysql2\lib\connection.js:515:28)
    at PacketParser.onPacket (D:\Users\Temp\Desktop\POregister\node_modules\mysql2\lib\connection.js:94:16)
    at PacketParser.executeStart (D:\Users\Temp\Desktop\POregister\node_modules\mysql2\lib\packet_parser.js:77:14)
    at Socket.<anonymous> (D:\Users\Temp\Desktop\POregister\node_modules\mysql2\lib\connection.js:102:29)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at Socket.Readable.push (_stream_readable.js:134:10)
    at TCP.onread (net.js:547:20)