byte index 129 is not a char boundary; it is inside '\u{200b}'

[152334H]

$ RUST_BACKTRACE=1 leetcode p 1653

[1653] Minimum Deletions to Make String Balanced is on the run...


thread 'main' panicked at 'byte index 129 is not a char boundary; it is inside '\u{200b}' (bytes 127..130) of `<p>You are given a string <code>s</code> consisting only of characters <code>&#39;a&#39;</code> and <code>&#39;b&#39;</code>​​​​.</p>

<p>You can delete any number of characters in <code>s</code> to make <code>s</code> <strong>balanced</strong>. <c`[...]', /home/throwaway/.cargo/registry/src/github.com-1ecc6299db9ec823/leetcode-cli-0.3.10/src/helper.rs:183:58
stack backtrace:
   0: rust_begin_unwind
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/std/src/panicking.rs:517:5
   1: core::panicking::panic_fmt
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/core/src/panicking.rs:101:14
   2: core::str::slice_error_fail
   3: <alloc::string::String as leetcode_cli::helper::html::HTML>::ser
   4: <alloc::string::String as leetcode_cli::helper::html::HTML>::render
   5: <leetcode_cli::cache::models::Question as core::fmt::Display>::fmt
   6: core::fmt::write
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/core/src/fmt/mod.rs:1150:17
   7: std::io::Write::write_fmt
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/std/src/io/mod.rs:1667:15
   8: <&std::io::stdio::Stdout as std::io::Write>::write_fmt
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/std/src/io/stdio.rs:852:9
   9: <std::io::stdio::Stdout as std::io::Write>::write_fmt
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/std/src/io/stdio.rs:826:9
  10: std::io::stdio::print_to
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/std/src/io/stdio.rs:1192:21
  11: std::io::stdio::_print
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/std/src/io/stdio.rs:1205:5
  12: <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll
  13: <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll
  14: tokio::macros::scoped_tls::ScopedKey<T>::set
  15: tokio::runtime::basic_scheduler::BasicScheduler<P>::block_on
  16: tokio::runtime::context::enter
  17: tokio::runtime::handle::Handle::enter
  18: leetcode::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

Problem link here. The \u200b characters appear right before the first closing p tag in the error.