Warning: A component is changing an uncontrolled input of type undefined to be controlled.

[Pong420]

Warning: A component is changing an uncontrolled input of type undefined to be controlled. Input elements should not switch from uncontrolled to controlled (or vice versa). Decide between using a controlled or uncontrolled input element for the lifetime of the component. More info: https://fb.me/react-controlled-components
    in input (at src/index.tsx:8)
    in Input (at src/index.tsx:14)
    in Field (at src/index.tsx:13)
    in form (created by ForwardRef(Form))
    in ForwardRef(Form) (at src/index.tsx:12)
    in App (at src/index.tsx:21)

Step to reproduce

1. Open CodeSandbox
2. Expand Codesandbox's console
3. Type on the input filed

[Pong420]

Solved by
Adding placeholder="" to Input component

Edit: Not solved

[Pong420]

Solved by adding initialValues={{username: ''}} to Form