Hello BliniReizen,
The parameters of ACF get_field() are as follows:
get_field($selector, [$post_id], [$format_value]);
So your test code should look like this:
$tip = get_field("tip",$post->ID);
if( $tip ) {
echo $tip;
} else {
echo ’empty’;
}
Give this a try. The third parameter is true by default ($format_value).
Thanks,
John