Sorry to bother again but yet i haven't found a solution to the error of "Variable passed to each() is not an array..." in my logs. Here the exact lines:

reset() expects parameter 1 to be array, null given in /var/www/vhosts/laviadellincenso.it/httpdocs/includes/classes/dynamic_price_updater.php on line 197
Variable passed to each() is not an array or object in /var/www/vhosts/laviadellincenso.it/httpdocs/includes/classes/dynamic_price_updater.php on line 198

DPU is working correctly, I just got the chace spammed with this error log... If someone has a solution I'll appreciate a lot ;-)