console.js:288 Warning: Each child in a list should have a unique "key" prop.

Check the render method of PageLayout. See https://fb.me/react-warning-keys for more information.
in WithStyles(ForwardRef(Grid)) (created by PageLayout)
in PageLayout (created by ViewTemplateDetails)
in ViewTemplateDetails (created by Context.Consumer)
in Route (created by RenderRoute)
in Switch (created by RenderRoute)
in Suspense (created by RenderRoute)
in RenderRoute (created by App)
in IntlProvider (created by App)
in div (created by MainLayout)
in PagePermissions (created by MainLayout)
in main (created by MainLayout)
in div (created by MainLayout)
in div (created by MainLayout)
in SubscriptionsProvider (created by MainLayout)
in DatadogProvider (created by MainLayout)
in AppInsightsLogger (created by MainLayout)
in MainLayout (created by App)
in Router (created by BrowserRouter)
in BrowserRouter (created by App)
in ForwardRef (created by AuthProvider)
in AuthProvider (created by App)
in StylesProvider (created by ThemeProvider)
in ThemeProvider (created by ThemeProvider)
in ThemeProvider (created by MainProvider)
in SettingsProvider (created by MainProvider)
in MainProvider (created by App)
in App
in Provider

Empieza localizando el método de renderizado de PageLayout mencionado en la advertencia y reproduce el problema en la ruta ViewTemplateDetails. Rastrea la lista que desencadena la advertencia y, después, verifica que la consola esté limpia cuando se renderice la ruta.