[Zope] Zope 2.1.3 Crashes on ftp access

[Robb Shecter]

Hi,

I'm trying to retrieve a file via ftp, and Zope locks up: either just
the ftp transfer, or occasionally the whole server.  It's printing the
following error message:

2000-02-18T10:28:45 ERROR(200) ZServer exception in trigger thunk:
(exceptions.AttributeError:'None' object has no attribute '_producers'
[/usr/local/zope/2-1-3/ZServer/medusa/select_trigger.py|handle_read|82]
[/usr/local/zope/2-1-3/ZServer/FTPResponse.py|apply|145]
[/usr/local/zope/2-1-3/ZServer/FTPServer.py|retr_completion|360])

Anybody got a solution?

Thanks,
Robb