Layers on Mobile: HTTP 500 error in browser
When viewing your Layers site on a mobile device or mobile browser user agent, you see an HTTP 500 error. Viewing the site normally or in a responsive tester works fine.
This is usually caused by mobile device detection active on your site is not working or able to display Layers pages. HTTP 500 errors are not theme related and are related to your server or plugins. It is possible the site was down, or the link was incorrect (ensure Settings > Permalinks is set to Post Name). Keep in mind you cannot use the WordPress customizer or other admin functions from a mobile phone.
Please ensure you do not have any plugins enabled that attempt to handle mobile. This includes the Mobile Theme module in Jetpack.