utf 8 error

[suprohub]

when i trying to send [0] buffer i get this strange error
thread 'main' panicked at src/main.rs:48:61:
called Result::unwrap() on an Err value: MalformedError(Utf8Error { valid_up_to: 37, error_len: Some(1) })
there 37 bytes?

[Wojtek242]

Can you provide a full example of your code to reproduce this error?