diff --git a/src/lib.rs b/src/lib.rs
index fee5985..7f00284 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1016,6 +1016,8 @@ mod tests {
             format(input, &QueryParams::Indexed(params), options),
             expected
         );
+
+        format("?62666666121266666612", &QueryParams::None, options);
     }
 
     #[test]
diff --git a/src/tokenizer.rs b/src/tokenizer.rs
index 0e369c8..3f480d2 100644
--- a/src/tokenizer.rs
+++ b/src/tokenizer.rs
@@ -301,12 +301,16 @@ fn get_indexed_placeholder_token(input: &str) -> IResult<&str, Token<'_>> {
             Token {
                 kind: TokenKind::Placeholder,
                 value: token,
-                key: if token.starts_with('$') {
-                    let index = token[1..].parse::<usize>().unwrap();
-                    Some(PlaceholderKind::OneIndexed(index))
-                } else if token.len() > 1 {
-                    let index = token[1..].parse::<usize>().unwrap();
-                    Some(PlaceholderKind::ZeroIndexed(index))
+                key: if token.len() > 1 {
+                    if let Ok(index) = token[1..].parse::<usize>() {
+                        Some(if token.starts_with('$') {
+                            PlaceholderKind::OneIndexed(index)
+                        } else {
+                            PlaceholderKind::ZeroIndexed(index)
+                        })
+                    } else {
+                        None
+                    }
                 } else {
                     None
                 },