Can not access URL parameter in the frontpage

Hello everyone!

I try to get URL parameter in the frontpage but I does not work, however when using parameter in custom page in works.

E.g It works in example.com/custompage/?someParamater=nay , but does not work in example.com/?someParameter=yay

I don’t use a simple _GET but WordPress functions (as I believe it is more secure? as I use it in get_posts later) The code I use:

First I define a filter in the functions:

function themeslug_query_vars( $qvars ) {
$qvars[] = 'someParameter';
return $qvars;
}
add_filter( 'query_vars', 'themeslug_query_vars' );

Then I use it in my page as follows:

get_query_var('someParameter')

Thank you!