Failed login records stop working

Hello team,

Any idea on why Failed login records function stops working. I see only this massage:

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 90 bytes) in /sata1/home/users/malynrada/www/www.malyn-rada.gov.ua/wp-includes/wp-db.php on line 1889

And most important: how to make this working again or at least investigate a root cause?

Thank you in advance?