ERROR[Main]: ServerError: AsyncErr: Lua: Runtime error from mod 'mail' in callback on_playerReceiveFields(): ...minetest/bin/../mods/mail/ui/maillists.lua:25: bad argument #1 to 'len' (string expected, got nil)
ERROR[Main]: stack traceback:
ERROR[Main]: 	[builtin:len]: in function 'len'
ERROR[Main]: 	...minetest/bin/../mods/mail/ui/maillists.lua:25: in function 'show_maillists'
ERROR[Main]: 	...minetest/bin/../mods/mail/ui/events.lua:316: in function <...minetest/bin/../mods/mail/ui/events.lua:17>
ERROR[Main]: 	...minetest/bin/../builtin/common/register.lua:26: in function <...minetest/bin/../builtin/common/register.lua:12>