null TTY warning- what is causing this?

[Pollywog <pollywog@shadypond.com>]

I am getting this in my logs.  What does it mean?


> 
> Unusual System Events
> =-=-=-=-=-=-=-=-=-=-=
> May 12 18:35:00 lilypad kernel: Warning: null TTY for (05:00) in tty_select 
> May 12 18:35:00 lilypad kernel: Warning: null TTY for (05:00) in tty_select 


thanks

--
Andrew


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