Warning: Undefined array key “pagination_postsperpage”

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Hi, I’m working on my first website, and this error table occurred. Does anyone know how to fix this? I’ve seen some guys on StackOverflow dealing with an ‘Undefined array key’ error in PHP and using this piece of code:

if (isset($lookup_table[$key])) {
return $lookup_table[$key];
}

else {
return;
}

But since I’m really new to this, I’m not sure where I should put it.

​

PS: I’m using Local.exe for “hosting” while I’m working on it. Could that be a problem?

https://preview.redd.it/sif5wdaf8hzc1.png?width=1403&format=png&auto=webp&s=2bb2d7f8b5afaffe69dab46c47118a091562e7fc

https://preview.redd.it/rqjz0naf8hzc1.png?width=1403&format=png&auto=webp&s=d5426e339505199b0d47f05158f90d7255f765e6

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