mod_offline_email: nil value

[GoogleCodeExporter]

hi have prosody 0.9.2 and lib event enabled and offline_email work for first 
but after crash with 

Jan 23 06:59:18 general error   Top-level error, please report:
...sody-modules/mod_offline_email/mod_offline_email.lua:68: attempt to 
concatenate a nil value
Jan 23 06:59:18 general error
stack traceback:
        /usr/bin/prosody:1: in function 'loop'
        /usr/lib/prosody/net/server_event.lua:786: in function </usr/lib/prosody/net/server_event.lua:785>
        [C]: in function 'xpcall'
        /usr/bin/prosody:372: in function 'loop'
        /usr/bin/prosody:402: in main chunk
        [C]: ?

Original issue reported on code.google.com by cama...@gmail.com on 23 Jan 2014 at 7:25

[GoogleCodeExporter]

and when the e-mail is sent the sender is empty

Original comment by cama...@gmail.com on 23 Jan 2014 at 7:47