Hi, This is a bug report based on the issue discussed at https://github.com/lualatex/luaotfload/issues/212
\font\tenrm{file:lmroman10-regular.otf:mode=node;script=latn}\tenrm \setbox0\vbox{% x\penalty-10000 $a$x$a$ } \unvbox0 \setbox0\lastbox \unhbox0 \end The plain tex code shown above fails with a lua error: luatex-fonts-merged.lua:9616: attempt to index local 'current' (a nil value) My guess is: as math-on (math-off too) is a "discardable" item after a linebreak, the first math-on node has gone away. So the math-on/math-off pair has become broken, by which the behavior of "node.end_of_math" is confused. Regards, -- Dohyun Kim Seoul, Republic of Korea ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________