Linux build failed to run

[spvkgn]

Failed to run on Ubuntu 22.04

$ RUST_BACKTRACE=full cfspeedtest
Starting Cloudflare speed test
Country: RU
Ip: deleted
Colo: DME
latency test    [=-----------------------------]
thread 'main' (3166946) panicked at src/speedtest.rs:217:10:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0:     0x55bcd16ef922 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h93773fc827e3113d
   1:     0x55bcd1702b6a - core::fmt::write::hed7b5c73d82ecb7c
   2:     0x55bcd16c6e06 - std::io::Write::write_fmt::h6f0185aecf0ed75f
   3:     0x55bcd16d1af9 - std::panicking::default_hook::{{closure}}::h2be84df4f189ae36
   4:     0x55bcd16d1959 - std::panicking::default_hook::hf0ea8939246f43a9
   5:     0x55bcd16d1deb - std::panicking::panic_with_hook::hb4bd9ac1123582a0
   6:     0x55bcd16d1bea - std::panicking::panic_handler::{{closure}}::hde00dd15f5637fe2
   7:     0x55bcd16cef09 - std::sys::backtrace::__rust_end_short_backtrace::hb72197fa777c1785
   8:     0x55bcd16bb26d - __rustc[4425a7e20b4c8619]::rust_begin_unwind
   9:     0x55bcd170d1fc - core::panicking::panic_fmt::ha59b517dd231f4da
  10:     0x55bcd170d1c2 - core::panicking::panic::hbff2745fd4c5afec
  11:     0x55bcd170c4b9 - core::option::unwrap_failed::h15daa19f2c0a511f
  12:     0x55bcd13262d8 - cfspeedtest::speedtest::test_latency::h22dc09744900203b
  13:     0x55bcd1326d6c - cfspeedtest::speedtest::run_latency_test::h5f1020d50aaa1cb6
  14:     0x55bcd1324466 - cfspeedtest::speedtest::speed_test::h1eaefdaaa41d26dd
  15:     0x55bcd131263a - cfspeedtest::main::hb7c0ef1b73aa13f2
  16:     0x55bcd1311db3 - std::sys::backtrace::__rust_begin_short_backtrace::hf94d4908615844c9
  17:     0x55bcd1311da9 - std::rt::lang_start::{{closure}}::h2812cba7a9e06c32
  18:     0x55bcd16c8a56 - std::rt::lang_start_internal::h9f282d832ae47dd5
  19:     0x55bcd1314c85 - main
  20:     0x7f696b31ad90 - __libc_start_call_main
                               at ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
  21:     0x7f696b31ae40 - __libc_start_main_impl
                               at ./csu/../csu/libc-start.c:392:3
  22:     0x55bcd1310165 - _start
  23:                0x0 - <unknown>

[timsj]

Same `Option::unwrap()` on a `None` value error at speedtest.rs:217:10 here on Fedora 43.