Hi, after upgrading to the latest context beta, I'm fased with the following lua error: define font | forced type otf of lmmono8-regular not found define font | font with name lmmono8-regular is not found [...] ! LuaTeX error /usr/share/texmf/tex/context/base/math-vfu.lua:366: table index is nil stack traceback: /usr/share/texmf/tex/context/base/math-vfu.lua:366: in function (tail call): ? (tail call): ? /usr/share/texmf/tex/context/base/font-def.lua:549: in function 'read' /usr/share/texmf/tex/context/base/font-ctx.lua:359: in function 'command_2' <main ctx instance>:1: in main chunk. Apparently there is still some font cache somewhere that's not updated, and context says it has a font that is not found. However, a bit further down, this crashes. The cause of this is that the "nullfont" is returned as defined in font-ini.lua, not just nil: fonts.ids[0] = { -- nullfont characters = { }, descriptions = { }, } This font has no name, but math-vfu.lua uses fs.name unconditionally. Either math-vfu.lua should be fixed to test for this, or a line should be added to the null font above: name = "", I've tested the latter, and it solves my immediate problem. Gr. Matthijs