[NTG-context] Failure when loading variable font

[Marcel Krüger via ntg-context]

Hi,

the latest ConTeXt version fails for the following
document:

    \definefontfeature
      [default:test]
      [default]
      [axis={Weight=100}]
    \definefont
      [SomeFont]
      [file:Fraunces.ttf*default:test]
    \starttext
    \SomeFont Abcdef
    \stoptext

and the font from
https://github.com/undercasetype/Fraunces/raw/master/fonts/Fraunces%5BSOFT%2CWONK%2Copsz%2Cwght%5D.ttf
renamed to Fraunces.ttf

with the error message

    otf reader      > user instance: weight=100, factors: 0 -1.0 0 0
    otf reader      > fatal error in file 'Fraunces.ttf': 
...e0dde776fb1556f32e/formats/luametatex/font-ttf-macro.lua:274: attempt to 
index a nil value (local 'p1')
    stack traceback:
            ...e0dde776fb1556f32e/formats/luametatex/font-otr-macro.lua:2339: 
in metamethod 'index'
            ...e0dde776fb1556f32e/formats/luametatex/font-ttf-macro.lua:274: in 
upvalue 'applyaxis'
            ...e0dde776fb1556f32e/formats/luametatex/font-ttf-macro.lua:1428: 
in field 'gvar'
            ...e0dde776fb1556f32e/formats/luametatex/font-ttf-macro.lua:1155: 
in local 'reader'
            ...e0dde776fb1556f32e/formats/luametatex/font-otr-macro.lua:2084: 
in upvalue 'readtable'
            ...e0dde776fb1556f32e/formats/luametatex/font-otr-macro.lua:2197: 
in upvalue 'readdata'
            ...e0dde776fb1556f32e/formats/luametatex/font-otr-macro.lua:2252: 
in function <...e0dde776fb1556f32e/formats/luametatex/font-otr-macro.lua:2235>
            [C]: in function 'xpcall'
            ...e0dde776fb1556f32e/formats/luametatex/font-otr-macro.lua:2341: 
in upvalue 'loadfont'
            ...e0dde776fb1556f32e/formats/luametatex/font-otr-macro.lua:2396: 
in field 'loadfont'
            ...mtx/tex/texmf-context/tex/context/base/mkiv/font-otl.lua:160: in 
field 'load'
            ...mtx/tex/texmf-context/tex/context/base/mkiv/font-otl.lua:599: in 
upvalue 'otftotfm'
            ...mtx/tex/texmf-context/tex/context/base/mkiv/font-otl.lua:627: in 
function <...mtx/tex/texmf-context/tex/context/base/mkiv/font-otl.lua:626>
            (...tail calls...)
            ...mtx/tex/texmf-context/tex/context/base/mkxl/font-def.lmt:377: in 
function <...mtx/tex/texmf-context/tex/context/base/mkxl/font-def.lmt:365>
            (...tail calls...)
            ...mtx/tex/texmf-context/tex/context/base/mkxl/font-def.lmt:483: in 
field 'read'
            ...mtx/tex/texmf-context/tex/context/base/mkxl/font-ctx.lmt:1336: 
in function <...mtx/tex/texmf-context/tex/context/base/mkxl/font-ctx.lmt:1193>
            (...tail calls...)
    fonts           > otf loading > loading failed due to read error

(This run used luametatex, but the same issue occurs when using luatex)
The same font worked correctly with the ConTeXt version from 2021-05-20.

Best regards,
Marcel 
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