RSS Feed/News Only functions with whitelisted prefixes are allowed

[ENXF NET]

After updating to 2.3.7 an addon I made no longer works, is there any info on this error documented I cant find anything.

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Line 2: The function getimdbid may not be called in a template. Only functions with whitelisted prefixes are allowed. - Template name: public:imdb
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In Template.
Code:

<xf:if is="{$thread.getimdbid("id")}">

Entity
Code:

namespace Imdb\Info\Entity;

class Thread extends XFCP_Thread
    {
    public function...

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