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Checkbox component has warning #1056

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@yhrchan

Description

@yhrchan

Checked out code, run npm install, then yarn start, accessed demo via localhost:8080

Steps to reproduce:

  1. go to MUI demo
  2. drag CHECKBOX component to form builder
  3. enter in a value for "Label"
  4. click the plus sign besides Options in the Properties Editor
  5. click the plus sign again to create a 2nd options entry

Two warning messages encountered:

react-dom.development.js:88 Warning: The tag is unrecognized in this browser. If you meant to render a React component, start its name with an uppercase letter.
in checkbox (created by ForwardRef(ButtonBase))
in ForwardRef(ButtonBase) (created by WithStyles(ForwardRef(ButtonBase)))
in WithStyles(ForwardRef(ButtonBase)) (created by ForwardRef(IconButton))
in ForwardRef(IconButton) (created by WithStyles(ForwardRef(IconButton)))
in WithStyles(ForwardRef(IconButton)) (created by ForwardRef(SwitchBase))
in ForwardRef(SwitchBase) (created by WithStyles(ForwardRef(SwitchBase)))
in WithStyles(ForwardRef(SwitchBase)) (created by ForwardRef(Checkbox))
in ForwardRef(Checkbox) (created by WithStyles(ForwardRef(Checkbox)))
in WithStyles(ForwardRef(Checkbox)) (created by FinalCheckbox)
in label (created by ForwardRef(FormControlLabel))
in ForwardRef(FormControlLabel) (created by WithStyles(ForwardRef(FormControlLabel)))
in WithStyles(ForwardRef(FormControlLabel)) (created by FinalCheckbox)
in FinalCheckbox (created by SingleCheckbox)
in SingleCheckbox (created by MultipleChoiceList)
in div (created by ForwardRef(FormGroup))
in ForwardRef(FormGroup) (created by WithStyles(ForwardRef(FormGroup)))
in WithStyles(ForwardRef(FormGroup)) (created by Wrapper)
in fieldset (created by ForwardRef(FormControl))
in ForwardRef(FormControl) (created by WithStyles(ForwardRef(FormControl)))
in WithStyles(ForwardRef(FormControl)) (created by Wrapper)
in div (created by ForwardRef(Grid))
in ForwardRef(Grid) (created by WithStyles(ForwardRef(Grid)))

Warning: Encountered two children with the same key, 1621206633539-. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.
in div (created by ForwardRef(FormGroup))
in ForwardRef(FormGroup) (created by WithStyles(ForwardRef(FormGroup)))
in WithStyles(ForwardRef(FormGroup)) (created by Wrapper)
in fieldset (created by ForwardRef(FormControl))
in ForwardRef(FormControl) (created by WithStyles(ForwardRef(FormControl)))
in WithStyles(ForwardRef(FormControl)) (created by Wrapper)
in div (created by ForwardRef(Grid))
in ForwardRef(Grid) (created by WithStyles(ForwardRef(Grid)))
in WithStyles(ForwardRef(Grid)) (created by Wrapper)
in Wrapper (created by MultipleChoiceList)
in MultipleChoiceList (created by MultipleChoiceList)
in MultipleChoiceList (created by Checkbox)
in Checkbox (created by ComponentWrapper)
in div (created by ComponentWrapper)
in ComponentWrapper (created by Draggable)
in div (created by ForwardRef(Paper))
in ForwardRef(Paper) (created by WithStyles(ForwardRef(Paper)))
in WithStyles(ForwardRef(Paper)) (created by ForwardRef(Card))
in ForwardRef(Card) (created by WithStyles(ForwardRef(Card)))
in WithStyles(ForwardRef(Card)) (created by FieldLayout)
in div (created by FieldLayout)
in FieldLayout (created by Draggable)
in div (created by Draggable)
in Draggable (created by Connect(Draggable))
in Connect(Draggable) (created by PrivateDraggable)
in PrivateDraggable (created by PublicDraggable)
in PublicDraggable

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