no answer needed, I'm adding the question as reference

After todays update of luaotfload microtype gives an error when used with lualatex:





leads to

/tex/latex/microtype/microtype.lua:145: attempt to call field 'warning' (a nil v
stack traceback:
    ...exlive/2018/texmf-dist/tex/latex/microtype/microtype.lua:145: in main chunk
    [C]: in function 'require'
    [\directlua]:1: in main chunk.
l.59 \MT@lua{require("microtype")}

1 Answer 1


This is due to a bug in microtype. It uses an undefined lua-function, the bug appears now due as a side-effect of some changes in luaotfload.

A work-around until microtype is fixed is to load luatexbase:



  • 12
    Oh no, right now texlive 2018 is frozen with this bug in it. I hope the texlive people can make an exception for this that breaks so many documents!
    – pst
    Feb 27, 2019 at 8:24
  • 2
    @Krishna then we would have had a broken luaotfload in texlive (the letterspacing didn't work). This would have been much worser. Feb 27, 2019 at 19:08
  • 3
    @Krishna no it broke from version 2.94 to 2.95, the problem was only there for around two weeks: github.com/u-fischer/luaotfload/issues/38. Feb 27, 2019 at 19:13
  • 1
    @UlrikeFischer cool. Got it. Thank you for fixing this. Feb 27, 2019 at 19:15
  • 8
    microtype should be fixed in v2.7b tug.org/pipermail/tex-live-commits/2019-March/008911.html, just a tad is too late for TeX live 2018.
    – moewe
    Mar 3, 2019 at 8:22

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