ltn12.lua variable 'unpack' is not declared

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Starting Nmap 7.80 ( https://nmap.org ) at 2020-08-22 22:45 EDT
NSE: Updating rule database.
NSE: Failed to load /usr/bin/../share/nmap/scripts//web_techno.nse:
/usr/share/lua/5.3/ltn12.lua:12: variable 'unpack' is not declared
stack traceback:
        [C]: in function 'libssh2-utility.error'
        /usr/bin/../share/nmap/nselib/strict.lua:80: in metamethod '__index'
        /usr/share/lua/5.3/ltn12.lua:12: in main chunk
        [C]: in function 'libssh2-utility.require'
        /usr/share/lua/5.3/socket/http.lua:12: in main chunk
        [C]: in function 'libssh2-utility.require'
        /usr/bin/../share/nmap/scripts//web_techno.nse:22: in function </usr/bin/../share/nmap/scripts//web_techno.nse:1>
NSE: failed to initialize the script engine:
/usr/bin/../share/nmap/nse_main.lua:614: could not load script
stack traceback:
        [C]: in function 'libssh2-utility.error'
        /usr/bin/../share/nmap/nse_main.lua:614: in field 'new'
        /usr/bin/../share/nmap/nse_main.lua:1294: in main chunk
        [C]: in ?

QUITTING!