[Fixed] Some users cannot connect anymore since 16.09 update - Pubsub errors

Hello,

I finally did the move to upgrade to the latest version. Unfortunately, I cannot manage to make it work to all my users. It works fine for most of the users, but I have one that is always immediately disconnected.

After investigating the log, it is due to the error: 

2016-11-24 00:23:40.450 [error] <0.609.0> gen_fsm <0.609.0>
 in state session_established terminated with reason: bad argument in call to
 fxml:element_to_binary({xmlel,<<"message">>,
  [{<<"from">>,<<"account@server">>},{<<"to">>,<<"account@serv...">>},...],\
...})
 in ejabberd_c2s:send_element/2 line 1934
2016-11-24 00:23:40.453 [error] <0.609.0> CRASH REPORT Process <0.609.0>
 with 0 neighbours exited with reason: bad argument in call to
 fxml:element_to_binary({xmlel,<<"message">>,
  [{<<"from">>,<<"account@server">>},{<<"to">>,<<"account@serv...">>},...],..\
.})
 in ejabberd_c2s:send_element/2 line 1934

A more detailed aspect of the problem seems explained in the crash.log file:

2016-11-24 00:23:40 =ERROR REPORT====
** State machine <0.609.0> terminating
** Last message in was {send_filtered,{pep_message,<<"http://jabber.org/protocol/geoloc+notify">>},{jid,<<"user">>,<<"domain.org">>,<<>>,<<"user">>,<<"domain.org">>,<<>>},{jid,<<"user">>,<<"domain.org">>,<<"user">>,<<"user">>,<<"domain.org">>,<<"user">>},{xmlel,<<"messag\
e">>,[{<<"type">>,<<"headline">>}],[{xmlel,<<"event">>,[{<<"xmlns">>,<<"http://jabber.org/protocol/pubsub#event">>}],[{xmlel,<<"items">>,[{<<"node">>,<<"http://jabber.org/protocol/geoloc">>}],[{xmlel,<<"item">>,[{<<"id">>,"549BDBCB4583D"}],[{xmlelement,"geoloc",[{"xmlns"\
,"http://jabber.org/protocol/geoloc"}],[]}]}]}]},{xmlel,<<"delay">>,[{<<"xmlns">>,<<"urn:xmpp:delay">>},{<<"from">>,<<"user@domain.org/Portable">>},{<<"stamp">>,<<"2012-11-24T17:12:43Z">>}],[{xmlcdata,<<>>}]}]}}
** When State == session_established
**      Data  == {state,{socket_state,fast_tls,{tlssock,#Port<0.32317>,#Port<0.32318>},<0.608.0>},ejabberd_socket,#Ref<0.0.1.13766>,false,<<"10356939927130984092">>,undefined,c2s,c2s_shaper,false,true,false,true,[verify_none,compression_none,{certfile,<<"/etc/ssl/ejabber\
d/domain.org.pem">>}],true,{jid,<<"user">>,<<"domain.org">>,<<"user">>,<<"user">>,<<"domain.org">>,<<"user">>},<<"user">>,<<"domain.org">>,<<"user">>,{{1479,943420,2},<0.609.0>},{pres_t,32},{pres_f,32},{pres_a,2},{xmlel,<<"presence">>,[{<<"xml:lang">>,<<"fr">>}],[{xmlcda\
ta,<<"\n">>},{xmlel,<<"priority">>,[],[{xmlcdata,<<"5">>}]},{xmlcdata,<<"\n">>},{xmlel,<<"c">>,[{<<"xmlns">>,<<"http://jabber.org/protocol/caps">>},{<<"node">>,<<"http://psi-im.org/caps">>},{<<"ver">>,<<"caps-b75d8d2b25">>},{<<"ext">>,<<"cs ep-notify-2 html">>}],[]},{xml\
cdata,<<"\n">>}]},{1479,943420,370064},{userlist,none,[],false},c2s_tls,ejabberd_auth_ldap,{{192,168,0,4},60780},[{caps_resources,{1,{{<<"user">>,<<"domain.org">>,<<"user">>},{caps,<<"http://psi-im.org/caps">>,<<"caps-b75d8d2b25">>,<<>>,[<<"cs">>,<<"ep-notify-2">>,<<"htm\
l">>]},nil,nil}}}],active,inactive,undefined,undefined,1000,undefined,300,300,60000,undefined,false,0,0,0,true,<<"fr">>}
** Reason for termination =
** {badarg,[{fxml,element_to_binary,[{xmlel,<<"message">>,[{<<"from">>,<<"user@domain.org">>},{<<"to">>,<<"user@domain.org/user">>},{<<"type">>,<<"headline">>}],[{xmlel,<<"event">>,[{<<"xmlns">>,<<"http://jabber.org/protocol/pubsub#event">>}],[{xmlel,<<"items">>,[{<<"nod\
e">>,<<"http://jabber.org/protocol/geoloc">>}],[{xmlel,<<"item">>,[{<<"id">>,"549BDBCB4583D"}],[{xmlelement,"geoloc",[{"xmlns","http://jabber.org/protocol/geoloc"}],[]}]}]}]},{xmlel,<<"delay">>,[{<<"xmlns">>,<<"urn:xmpp:delay">>},{<<"from">>,<<"user@domain.org/Portable">\
>},{<<"stamp">>,<<"2012-11-24T17:12:43Z">>}],[{xmlcdata,<<>>}]}]}],[]},{ejabberd_c2s,send_element,2,[{file,"src/ejabberd_c2s.erl"},{line,1934}]},{ejabberd_c2s,send_stanza,2,[{file,"src/ejabberd_c2s.erl"},{line,1944}]},{ejabberd_c2s,handle_info,3,[{file,"src/ejabberd_c2s.\
erl"},{line,1776}]},{p1_fsm,handle_msg,10,[{file,"src/p1_fsm.erl"},{line,582}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]}
2016-11-24 00:23:40 =CRASH REPORT====
  crasher:
    initial call: ejabberd_c2s:init/1
    pid: <0.609.0>
    registered_name: []
    exception exit: {{badarg,[{fxml,element_to_binary,[{xmlel,<<"message">>,[{<<"from">>,<<"user@domain.org">>},{<<"to">>,<<"user@domain.org/user">>},{<<"type">>,<<"headline">>}],[{xmlel,<<"event">>,[{<<"xmlns">>,<<"http://jabber.org/protocol/pubsub#event">>}],[{xmlel,<<\
"items">>,[{<<"node">>,<<"http://jabber.org/protocol/geoloc">>}],[{xmlel,<<"item">>,[{<<"id">>,"549BDBCB4583D"}],[{xmlelement,"geoloc",[{"xmlns","http://jabber.org/protocol/geoloc"}],[]}]}]}]},{xmlel,<<"delay">>,[{<<"xmlns">>,<<"urn:xmpp:delay">>},{<<"from">>,<<"user@dom\
ain.org/Portable">>},{<<"stamp">>,<<"2012-11-24T17:12:43Z">>}],[{xmlcdata,<<>>}]}]}],[]},{ejabberd_c2s,send_element,2,[{file,"src/ejabberd_c2s.erl"},{line,1934}]},{ejabberd_c2s,send_stanza,2,[{file,"src/ejabberd_c2s.erl"},{line,1944}]},{ejabberd_c2s,handle_info,3,[{file,\
"src/ejabberd_c2s.erl"},{line,1776}]},{p1_fsm,handle_msg,10,[{file,"src/p1_fsm.erl"},{line,582}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]},[{p1_fsm,terminate,8,[{file,"src/p1_fsm.erl"},{line,760}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl\
"},{line,247}]}]}
    ancestors: [<0.601.0>,ejabberd_listeners,ejabberd_sup,<0.63.0>]
    messages: [{send_filtered,{pep_message,<<"http://jabber.org/protocol/nick+notify">>},{jid,<<"anotherUser">>,<<"domain.org">>,<<>>,<<"anotherUser">>,<<"domain.org">>,<<>>},{jid,<<"user">>,<<"domain.org">>,<<"user">>,<<"user">>,<<"domain.org">>,<<"user">>},{xmlel,<<"me\
ssage">>,[{<<"type">>,<<"headline">>}],[{xmlel,<<"event">>,[{<<"xmlns">>,<<"http://jabber.org/protocol/pubsub#event">>}],[{xmlel,<<"items">>,[{<<"node">>,<<"http://jabber.org/protocol/nick">>}],[{xmlel,<<"item">>,[{<<"id">>,"54E4526472AC5"}],[{xmlelement,"nick",[{"xmlns"\
,"http://jabber.org/protocol/nick"}],[{xmlcdata,<<"anotherUser@domain.org">>}]}]}]}]},{xmlel,<<"delay">>,[{<<"xmlns">>,<<"urn:xmpp:delay">>},{<<"from">>,<<"anotherUser@domain.org/numitor">>},{<<"stamp">>,<<"2013-01-15T20:53:56Z">>}],[{xmlcdata,<<>>}]}]}}]
    links: [#Port<0.32318>]
    dictionary: [{'$internal_queue_len',0}]
    trap_exit: false
    status: running
    heap_size: 6772
    stack_size: 27
    reductions: 68283
  neighbours:

It seems like it is a bug to me, but I am not sure I really understand what happens. Thank you for the one who will allow me to solve this.