Use of uninitialized value within %domain_id_name

[fulltilt]

weiss jemand wie das hier verursacht wird bzw. wie das Problem beseitigt wird?

Code:

/etc/cron.daily/logrotate:
Use of uninitialized value within %domain_id_name in hash element at /var/www/ispcp/engine/traffic/ispcp-vrl-traff line 458.
Use of uninitialized value within %domain_id_name in hash element at /var/www/ispcp/engine/traffic/ispcp-vrl-traff line 653.
Use of uninitialized value within %domain_id_name in hash element at /var/www/ispcp/engine/traffic/ispcp-vrl-traff line 458.
Use of uninitialized value within %domain_id_name in hash element at /var/www/ispcp/engine/traffic/ispcp-vrl-traff line 653.