[object Object] instead of string

[Gabriel de Oliveira Barbosa]

Anyone have a idea why I'm seeing [object Object] where I expect an string ?
I'm running a "_view" with map and reduce that is currently outputting:
{
    rows: [
        {
            value: {
               * ip: { [object Object]: 2 }*
            },
            key: '2012-01-14'
        },
        {
            value: {
               * ip: { 192.168.1.100: 6 }*
            },
            key: '2012-01-13'
        }
    ]
}

In the second row it's working fine, but all the rest are broken. What I'm
doing wrong ?