Undefined index: cmspage_id_1

[vtrinel]

Hello, by modifying my homepage with appagebuilder I now have this message that appears when I want to see my site. I try to find what to do but I do not find the solution.

Thank you

 

$cms = new CMS((int)$formAtts['cmspage_id'.$index], Context::getContext()->language->id, Context::getContext()->shop->id);