search query returns an error code (for Admin)

when I hit the search button to find a certain palyer (on EU server page) on the top of my screen I get this error code :

phpBB Debug] PHP Notice: in file /var/www/vhosts/wot-news.com/http/application/models/crapi.php on line 139: Invalid argument supplied for foreach()
[phpBB Debug] PHP Notice: in file /var/www/vhosts/wot-news.com/http/application/models/crapi.php on line 139: Invalid argument supplied for foreach()

which suggests an error in your written code (obviously ). I think you might be interested to know about it.