Related Items Extended show incorrectly on menu items

I use two instances of Related Items Extended on my site, for example https://ehinger.nu/undervisning/kurser/kemi-1/lektioner/atomens-byggnad.html under "Trendar just nu" (to the left) and "Se också:" (bottom of page). If I go into an article, they both show up correctly, but not in the menu items.

I have set "Hide if empty" to "Yes", but the error message "Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/ehinger.nu/public_html/undervisning/modules/mod_relateditems_xtd/mod_relateditems_xtd.php on line 51" still appears.

Can you help me troubleshoot this issue?

Yours,

/Magnus
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