Ticking the "Ipernity" checkbox in FIST leads to a "call to an undefined function" error message

[Former user]

In https://tools.wmflabs.org/fist/fist.php? if I tick the box "Ipernity" I get the following error message printed to the web page:

"Fatal error: Call to undefined function get_ipernity_key() in /data/project/fist/public_html/fist.php on line 737"