The following MWE gives an error with LMTX 2020.09.05 \usemodule[vim] \definevimtyping[MATLABCODE][syntax=matlab] \starttext \startMATLABCODE saveas(gcf(), "output/same-sigma.png") \stopMATLABCODE \stoptext The error message is: callback error: ...metatex/texmf-context/tex/context/base/mkiv/lang-ini.lua:509: bad argument #1 to 'prehyphenchar' (luatex.lang expected, got no value) stack traceback: [C]: in function 'lang.prehyphenchar' ...metatex/texmf-context/tex/context/base/mkiv/lang-ini.lua:509: in field 'prehyphenchar' ...metatex/texmf-context/tex/context/base/mkiv/typo-brk.lua:171: in local 'method' ...metatex/texmf-context/tex/context/base/mkiv/typo-brk.lua:392: in upvalue 'typesetters_breakpoints_handler' [string "local tonut = nodes.tonut..."]:16: in function <[string "local tonut = nodes.tonut..."]:11> (...tail calls...) ...metatex/texmf-context/tex/context/base/mkiv/node-pro.lua:88: in function <...metatex/texmf-context/tex/context/base/mkiv/node-pro.lua:79> 1 >> \SYNBOL{}saveas(gcf(), \SYN[String]{"output/same-sigma.png"})\SYNEOL{} 2 mtx-context | fatal error: return code: 256 Any idea what is going on? Thanks, Aditya