Nor able to pass validation of address

[nitinsinghit]

var cs = require('coinstring');
cs.isValid(req.param('address') , 0x00) .

This check fails on me. Weird thing is that this check works on other laptops. Function below error out only on my laptop where versionCompare and version comparison is not buffer but on other machines comparison is buffer. Not sure whats going on. Please advice

function decode(base58str, version) {
var buf = base58.decode(base58str)
var versionLength

if (version == null)
versionLength = 0
else {
if (typeof version == 'number')
version = new Buffer([version])

versionLength = version.length
var versionCompare = buf.slice(0, versionLength)
if (versionCompare !== version) ///on debug I see on other machines that versionCompare and version are buffer
  throw new Error('Invalid version')

}
}