[lltx] lualatex-math cannot find unpack function

[Wolfgang Jeltsch]

Hi,

if I import both amsmath and lualatex-math, I get the following error
message when LuaLaTeX tries to process \begin{document}:

! LuaTeX error
.../texmf-dist/tex/lualatex/lualatex-math/lualatex-math.lua:46:
attempt to call upvalue 'unpack' (a nil value)
stack traceback:
        .../texmf-dist/tex/lualatex/lualatex-math/lualatex-math.lua:46:
        in function 'print_class_fam_slot'
        [string "\directlua "]:1: in main chunk.
\__lltxmath_set_mathchar:NN ...\int_eval:n {`#2})}
                                                  \scan_stop: 

What is the reason for this?

Best wishes,
Wolfgang