Editing data source causes "unique key prop" error.

Hi.
Because of complexity of my data I can't use insertRow prop, and I'm trying add data in my own way - directly to my data source. But when I add record I have problem with unique "key" prop, because BootstrapTable generates
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and there is no key prop. How can I force adding key or how I can add data directly into source?
Thank you for help.