Any idea what can cause the following error? I never encountered such a thing so I don't know where to start hunting. The error is new in mkiv, did not occur in mkii.

! LuaTeX error ...beta/tex/texmf-context/tex/context/base/lpdf-ini.lua:534: pdf.immediateobj() object in use
stack traceback:
[C]: in function 'pdfimmediateobj'
...beta/tex/texmf-context/tex/context/base/lpdf-ini.lua:534: in function '?'
...beta/tex/texmf-context/tex/context/base/lpdf-ini.lua:462: in function 'run'
...beta/tex/texmf-context/tex/context/base/lpdf-ini.lua:485: in function 'finalizedocument'
<main ctx instance>:1: in main chunk.
<inserted text> ...einjections.finalizedocument()}

                                                  

<inserted text> \the \everylastbackendshipout 
                                              \flushtextdata 
\actualshipout ...e \relax \the \everylastshipout 
                                                  \global \everylastshipout ...
\myshipout ...\@@ppmethod }\gobbleoneargument {#1}
                                                  \setnextrealpageno \afters...
\dofinaloutput ...hbox {\vbox {\dopagebody #1#2}}}
                                                  \the \everyaftershipout \a...
\finaloutput ...EAEAEA \dofinaloutput \fi \fi #1#2
                                                  \resetselectiepagina \incr...
...
l.41 \stopproduct

Hans van der Meer