Hi Nasser,
[INFO] make4ht-lib: parse_lg process file: insu17.htm ...e/2020/texmf-dist/tex/luatex/luaxml/luaxml-domobject.lua:62: bad argument #2 to 'format' (no value)
This seems indeed like an issue in LuaXML library. Can you post the insu17.htm file here? It seems that it somehow fails in the processing. It is also possible that it contains faulty HTML code, which would need to be fixed on TeX4ht side.
Best regards, Michal
