Top-level error: cannot resume dead coroutine (prosody 0.9.8)

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What steps will reproduce the problem?
1. my perl xmpp client connects to prosody

What is the expected output? What do you see instead?
normal login

What version of the product are you using? On what operating system?
Linux / Gentoo / Prosody: 0.9.8 

Please provide any additional information below.

Prosody-Log:
Apr 16 11:50:25 general error   Top-level error, please report:
cannot resume dead coroutine
Apr 16 11:50:25 general error   
stack traceback:
        /usr/lib/prosody/../../bin/prosody:1919252082: in function 'loop'
        /usr/lib/prosody/net/server_event.lua:793: in function </usr/lib/prosody/net/server_event.lua:792>
        [C]: in function 'xpcall'
        /usr/lib/prosody/../../bin/prosody:376: in function 'loop'
        /usr/lib/prosody/../../bin/prosody:407: in main chunk
        [C]: ?

# prosodyctl about
Prosody 0.9.8

# Prosody directories
Data directory:     /var/spool/jabber
Plugin directory:   /usr/lib/prosody/modules/
Config directory:   /etc/jabber
Source directory:   /usr/lib/prosody

# Lua environment
Lua version:                Lua 5.1

Lua module search paths:
  /usr/lib/prosody/?.lua
  /usr/share/lua/5.1/?.lua
  /usr/share/lua/5.1/?/init.lua
  /usr/lib/lua/5.1/?.lua
  /usr/lib/lua/5.1/?/init.lua
  /usr/share/lua/5.1/?.lua
  /usr/share/lua/5.1/?/init.lua

Lua C module search paths:
  /usr/lib/prosody/?.so
  /usr/lib/lua/5.1/?.so
  /usr/lib/lua/5.1/?.so
  /usr/lib/lua/5.1/loadall.so

LuaRocks:           Not installed

# Lua module versions
lfs:        LuaFileSystem 1.5.0
lxp:        LuaExpat 1.3.0
pposix:     0.3.6
socket:     LuaSocket 3.0-rc1
ssl:        0.4.1

Original issue reported on code.google.com by ronny.bo...@googlemail.com on 16 Apr 2015 at 9:53