Warning: validateDOMNesting(...): <div> cannot appear as a descendant of <p>.

[AndriiPetrashchukEmpeek]

I got the error

Warning: validateDOMNesting(...): <div> cannot appear as a descendant of <p>.

when I used the "SimpleList" component;

I supposed i got this error because i passed prop "secondaryText"
which pass to the prop "secondary" of ListItemText there we have the condition:
secondary={ hasSecondaryText ? Placeholder : undefined}
ListItemText it's node Element p
component Placeholder return to us div node element

Example

<SimpleList
primaryText={record => record.email}
secondaryText={record => record.roleId}
tertiaryText={record => (record.isActive ? 'Active' : 'Inactive')}
linkType="edit"
/>

Environment

React-admin version: ^3.12.2
React version: ^17.0.1
Browser: Google Chrome

[djhi]

So make sure your Placeholder component does not return a div

[fzaninotto]

I could reproduce the bug in the simple example by making the dataProvider slower. The problem comes from our <SimpleListLoading> component.