Internal Server Error

Undefined array key 0

[app_site/lib/base.php:2378] Base->error()
[app_site/app/main.php:678] Base->{closure}()
[app_site/lib/base.php:1987] Main->prodview()
[app_site/lib/base.php:1786] Base->call()
[index.php:28] Base->run()