Laravel validation required_if is not working

I have the email and password fields in which I only want them to be required if the add_user field value is 1. This is my validation:

public function rules() {
    return [
        'add_user' => ['required'],
        'password' => ['required_if:add_user,1', 'min:8'],
        'email' => ['required_if:add_user,1', 'email', 'max:255'],
    ];
}

This one is not working, it always errors even if the value is 0. I fill out the add_user value using jquery. I have a drop down that if the user clicked from the options, add_user value is 0, but if thru input, value is 1. Values are correct but the validation isn't working. Can someone help me figure this out?

via Chebli Mohamed