Repeater Ignore Null

I noticed if I create 3 field sets, but only input data in one, i get three sets saved, but only 1 filled. Shouldnt it ignore the null ones or do i need to set some logic for this? Right now I am getting:
[
    {
        "type": "office",
        "number": "555-555-5555",
        "extension": null
    },
    {
        "type": null,
        "number": null,
        "extension": null
    },
    {
        "type": null,
        "number": null,
        "extension": null
    }
]
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