Laravel Validation Integer accepts empty string?

Im creating some small API with which i can create blog posts through postman. Im using laravel 5 and i encoutered a problem.

In the API call, i can specify a user id, so the post is written by someone else than whoever makes the API call right now. My currently logged in user is specified with a token in postman.

So my problem is now, when i create the API call and specify my user_id as empty string "userID": ""

it will throw an error, because i specified the id to be an int like so

'userID' => ['integer']

The error is

"Type error: Argument passed to construct() must be of the type integer or null, string given",

Why does it accept an empty string? How can i validate that correctly?

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