Undefined index: path in views404_views_pre_view()

Hi,

I just moved servers, and with that OS versions (Debian "Lenny" -> "Squeeze"). On the old server, watchdog was clean, on the new server, the log is swamped with these errors:

PHP error:
Notice: Undefined index: path in views404_views_pre_view() (line 13 of /var/www/drupal/sites/all/modules/views404/views404.module).

Around the referenced line, the code is function views404_views_pre_view(&$view) {...}, and - sorry - I don't have the faintest idea what this might indicate.

Any suggestions?

Thanks & greetings, -asb