Buttons show warnings in the dev tools on each render

[dariadomagala-sap]

Description

Buttons render properly but show

Failed prop type: Cannot read property 'length' of undefined
   in Button

in the dev tools console.
It's problematic if I want to debug something and most of the errors visible are caused by the Button.

Versions

fundamental-react: 0.14.0-rc.27

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