diff --git a/lib/src/lib.rs b/lib/src/lib.rs
index 8c05706..6f24aa2 100644
--- a/lib/src/lib.rs
+++ b/lib/src/lib.rs
@@ -108,6 +108,7 @@ impl Report {
             ParseError::UnexpectedEOF | ParseError::UnexpectedEOFWanted(_) => {
                 TextRange::empty(0u32.into())
             }
+            ParseError::DuplicatedArgs(at, _) => at,
             _ => panic!("report a bug, pepper forgot to handle a parse error"),
         };
         let mut message = err.to_string();