help with PHP Warning

[alkemiko]

Hi,

I have an error log full of warnings:

[16-Feb-2021 06:51:08 UTC] PHP Warning: implode (): Invalid arguments passed in /home/xxxxxxxx/public_html/wp-includes/post-template.php on line 595
[16-Feb-2021 06:51:08 UTC] PHP Warning: array_merge (): Expected parameter 1 to be an array, null given in / home / xxxxxxxx / public_html / wp-content / plugins / elementor / includes / frontend. php on line 279
[16-Feb-2021 06:51:08 UTC] PHP Warning: array_unique () expects parameter 1 to be array, null given in /home/xxxxxxxx/public_html/wp-includes/post-template.php on line 838

Any help?

Regards