Undefined offset caused by plaxo favicon

Notice: Undefined offset: 1 in drupal_http_request() (line 920 of /var/aegir/platforms/7/servers/drupal-7.10/includes/common.inc). =>
Notice: Undefined offset: 2 in drupal_http_request() (line 924 of /var/aegir/platforms/7/servers/drupal-7.10/includes/common.inc). =>

devel backtrace:
9: drupal_http_request (Array, 4 elements)
file (String, 75 characters ) /var/aegir/platforms/7/modules/all/contact_impo...
line (Integer) 919
function (String, 19 characters ) drupal_http_request | (Callback) drupal_http_request();
args (Array, 6 elements)
0 (String, 30 characters ) http://m.plaxo.com/favicon.ico
1 (Array, 0 elements)
2 (String, 3 characters ) GET
3 (NULL)
4 (Integer) 2
5 (Integer) 4