Why do I have this error message?

On the main site when logged in there is no error message. But the error message is there again when logged out.

Please, how can I fix it?

I have same issue! Need fix!

I fixed this problem by adding some code in the /plugins/favorites/app/Entities/User/UserRepository.php

if($favorites==null){
$favorites = [];
}

Hi crest1314,

Where in the file did you put this code?

Replace line 188 or somewhere else?

Thanks in advance.