wp_insert_term is adding a term that has no name

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I’m trying to insert a term for a custom taxonomy and a custom post type in WordPress. The problem I’m running in to is that it successfully inserts a term, and at the right hierarchy level, but the term has no name. The line that inserts the term is: 

$lasttermarray = wp_insert_term($categoryname, "department", array( "parent" => $parentcategory ) );

I’ve checked to make sure that both $categoryname and $parentcategory are set to the right values. Like I said, the term is being inserted, just with a blank name. The slug of the blank term is being set to the ID of the new term.

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Is there any reason why the function would not be reading the name variable and causing it to do this? Thanks for your help.

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  1. As noted in the OP’s comments, some non-ASCII characters may not be supported in term names under certain conditions. To replace all suspect characters with an underscore, use the following code:

    $categoryname = preg_replace('/[^a-z0-9]/i', '_', strtolower($categoryname));
wp_insert_term($categoryname, "department");

    To replace all suspect characters with a dash, use the following code:

    $categoryname = preg_replace('/[^a-z0-9]/i', '-', strtolower($categoryname));
wp_insert_term($categoryname, "department");

    To simply remove all suspect characters, use the following code:

    $categoryname = preg_replace('/[^a-z0-9]/i', '', strtolower($categoryname));
wp_insert_term($categoryname, "department");

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