Type N: not enough input values, need 4 values but only 0 were provided in Branca.php:131

[crystaler4]

These are 9 error logs within 3 weeks:

ErrorException: unpack(): Type N: not enough input values, need 4 values but only 0 were provided in /var/www/example/com/vendor/tuupola/branca/src/Branca.php:131

Error is caused by bots sniffing around the website.

The line is:

 $parts = unpack("Cversion/Ntime", $header);

Maybe @unpack will help.