diff --git a/src/bin/raptor.rs b/src/bin/raptor.rs
index f9fe6eca7..20394208e 100644
--- a/src/bin/raptor.rs
+++ b/src/bin/raptor.rs
@@ -66,9 +66,14 @@ impl<'a> Service for MainService<'a> {
             body.push_str("<html><body>");
 
             while let Some((key, values, state)) = stream.next() {
-                let values = &values[..values.len().min(10)];
-                let distance = lev.distance(state);
-                body.push_str(&format!("<p>{:?} (dist: {:?}) {:?}</p>", key, distance, values));
+                match std::str::from_utf8(key) {
+                    Ok(key) => {
+                        let values = &values[..values.len().min(10)];
+                        let distance = lev.distance(state);
+                        body.push_str(&format!("<p>{:?} (dist: {:?}) {:?}</p>", key, distance, values));
+                    },
+                    Err(e) => eprintln!("{:?}", e),
+                }
             }
 
             body.push_str("</body></html>");
diff --git a/src/lib.rs b/src/lib.rs
index b50846144..e8eb1397d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,7 +9,6 @@ use std::ops::Range;
 use std::io::{Write, BufReader};
 use std::fs::File;
 use std::path::Path;
-use std::str::from_utf8_unchecked;
 use fst::Automaton;
 
 pub use self::fst_map::{FstMap, FstMapBuilder};
