Hi,

I get the following error with the latest beta (Arch Linux, Lua 5.2.3):

ConTeXt  ver: 2014.08.21 09:56 MKIV beta  fmt: 2014.8.22  int: english/english

.../context/tex/texmf-context/tex/context/base/publ-ini.lua:650:
attempt to index local 'used' (a nil value)
stack traceback:
.../context/tex/texmf-context/tex/context/base/publ-ini.lua:650: in
function 'enhance'
.../context/tex/texmf-context/tex/context/base/publ-dat.lua:151: in
function '__index'
.../context/tex/texmf-context/tex/context/base/publ-ini.lua:1349: in
function 'btxpreparelistentries'
[\directlua]:1: in main chunk

1     \usebtxdataset [example][mkiv-publications.bib]
2     \definebtxrendering[example][dataset=example]
3     \starttext
4     \chapter{One}
5         some text.\cite[example::demo-001]
6 >>      \placebtxrendering[example][criterium=all]
7     \stoptext
8
9

Minimal example:

\usebtxdataset [example][mkiv-publications.bib]
\definebtxrendering[example][dataset=example]
\starttext
\chapter{One}
    some text.\cite[example::demo-001]
    \placebtxrendering[example][criterium=all]
\stoptext

The following patch seems to fix the problem:

*** publ-ini.lua.old 2014-08-21 13:53:31.267777602 +0200
--- publ-ini.lua 2014-08-21 13:47:52.967781191 +0200
***************
*** 647,652 ****
--- 647,655 ----
                          local short = formatters["%t%02i"](t,mod(year,100))
                          local s = shorts[short]
                          -- we could also sort on reference i.e. entries.text
+                        if not used then
+                            used = { }
+                        end
                          local u = used[tag]
                          if u then
                              u = u[1].entries.text -- hm
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