Voicemail to Email issues

[nova2k]

Hi guys,

I'm having some issues with Voicemail to Email.

FusionPBX version 4.5.0

Switch version1.6.20 (64bit)

Here the Freeswitch logs

2018-05-01 16:32:00.137496 [ERR] mod_lua.cpp:203 ...scripts/app/voicemail/resources/functions/send_email.lua:166: attempt to index global 'subject' (a nil value)
stack traceback:
        ...scripts/app/voicemail/resources/functions/send_email.lua:166: in function 'send_email'
        /usr/share/freeswitch/scripts/app/voicemail/index.lua:579: in main chunk
        /usr/share/freeswitch/scripts/app.lua:48: in main chunk

Any ideas?