Error in Custom Taxonomy UI

The issue at first glance appears to be here..

add_action('game_edit_form_fields', 'game_form_fields');
add_action('game_add_form_fields', 'game_form_fields');
function game_form_fields($tag,$taxonomy) {

Your function is expecting 2 vars to be passed from the hook, but your add_action calls default to 1..

Eg, this..

add_action('game_edit_form_fields', 'game_form_fields');

Is equal to this..

add_action('game_edit_form_fields', 'game_form_fields', 10, 1 );

The fourth parameters sets how many arguments your callback function can take, and the default is 1, so that’s all your function ever receieves. Updating those add_action calls to the following should fix it..

add_action('game_edit_form_fields', 'game_form_fields', 10, 2 );

Hope that helps..

Follow-up #1

Maybe the hook isn’t passing a second variable, instead of the previous change, try update the function line to read..

function game_form_fields( $tag ) {

Perhaps that will fix it..

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