Custom Taxonomies in multiple forms

Hi,

i need an option to use custom taxonomies in multiple forms.
At the moment i use a hook for adding custom taxonomies instead of tags.

Unfortunately the hook doesn't work if i use it in more than one form.
Is there an option to adress a specific form and the id of the tag-field?

For now, the input appears in two custom taxonomies based on the field id...

Here is the code:

<?php
//Tag to Taxonomy - A fix for gravity forms

function hyp_tag_to_taxonomy( $form ){
     $id = $form['post_id'];
     $raw_tag_list = $form['12'];
     $tag_array = explode(',', $raw_tag_list);

     foreach ($tag_array as $tag){
          wp_set_object_terms( $id, $tag, 'collective',true);
     }
}

add_action( 'gform_post_submission', 'hyp_tag_to_taxonomy' );

?>