Internal Server Error

Undefined array key "id"

[jac/vendor/FatFreeFramework/base.php:2384] Base->error()
[jac/app/Controllers/show.php:127] Base->{closure}()
[jac/vendor/FatFreeFramework/base.php:1993] Controllers\Show->showpublic()
[jac/vendor/FatFreeFramework/base.php:1787] Base->call()
[jac/index.php:141] Base->run()