get_term_children returns unknown int though term has no child

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I am running get_term_children to check if a term has children. On a term which does not have have children wp returns an array containing a single int : 12 though that does not relate to any term. I did recently delete a child term though. 

 $hasChildren = get_term_children( $categories[$i]->term_id, 'my_tax' );
 var_dump($hasChildren);

returns 

array (size=1)
0 => int 12
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1 comment

  1. WordPress saves all taxonomy children term ids in an option for caching purpose. The option is named "$taxonomy_children". This option is created when you use the function get_term_children, but does not get updated that way. It’s only updated upon creating/updating parent or child term of that taxonomy using WP Admin UI.

    Rather than using WP Admin UI, if you deleted a term some other way, the option exists and therefore display wrong children information upon using get_term_children function. To solve this problem, you should manually delete the option named “$taxonomy_children” using the delete_option function or directly from your phpMyAdmin

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