Cannot read property 'replace' of undefined

[johnwp]

I'm getting the following error:

/app/node_modules/comma-separated-values/csv.js:50
    return string.replace(/"/g,'\\"');
                 ^
TypeError: Cannot read property 'replace' of undefined
    at sanitizeString (/app/node_modules/comma-separated-values/csv.js:50:18)

When executing the following code. Everything works fine without the configuration object.

new CSV(fileData, {
    header: [
        'monthNum',
        'projectedLossRateAtMonth',
        'actualLossRateAtMonth',
        'adjustedProjectedLossRate',
        'stressedLossRate',
        'breakEvenLossRate',
        'pim',
        'rating'
    ]
}).parse();

[CyrusNuevoDia]

Could you give me a sample of some of the fileData's contents?
Also, what version of CSV.js are you using?