It shows me error in decodetcpheader method

ok tcp
Waiting for the debugger to disconnect...
F:\zkteco\zklib\node_modules\node-zklib\zklibtcp.js:234
      const header = decodeTCPHeader(reply.subarray(0, 16))
                                           ^

TypeError: Cannot read properties of null (reading 'subarray')
    at F:\zkteco\zklib\node_modules\node-zklib\zklibtcp.js:234:44

Node.js v21.1.0