Bug : Material-UI: the `anchorEl` prop provided to the component is invalid.

On Firefox: The anchor element should be part of the document layout. Make sure the element is present in the document or that it’s not display none. Error on Chrome: checkPropTypes.js:20 Warning: Failed prop type: Material-UI: the anchorEl prop provided to the component is invalid. The anchor element should be part of the document layout. Make sure the element is present in the document or that it’s not display none. in ForwardRef(Popover) (created by WithStyles(ForwardRef(Popover))) in WithStyles(ForwardRef(Popover)) (created by ColorPicker) in div (created by ColorPicker) in ColorPicker (created by Uncontrolled) in Uncontrolled in Unknown in ThemeProvider (created by ThemeProvider) in ThemeProvider (created by ThemeProvider) in StylesProvider (created by ThemeProvider)