POST 500 error on AE Portfolio element

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Hi, I have the problem with AE Portfolio element query filter bar, not filtering articles anymore. The filter bar is based on tags.
It used to work, but now, when I click on one of the filter buttons, I receive this error in browser console:

jquery.js?ver=1.12.4-wp:4 POST https://kidsgogreen.eu/wp-admin/admin-ajax.php 500
send @ jquery.js?ver=1.12.4-wp:4
ajax @ jquery.js?ver=1.12.4-wp:4
(anonymous) @ ae-pro.min.js?ver=2.14.1:1
dispatch @ jquery.js?ver=1.12.4-wp:3
r.handle @ jquery.js?ver=1.12.4-wp:3

What it can be and what can I do to solve the problem?

• This topic was modified 17 minutes ago by haligaliharun.