diff --git a/server/src/nm.rs b/server/src/nm.rs
index 41a56ff..21ed258 100644
--- a/server/src/nm.rs
+++ b/server/src/nm.rs
@@ -987,7 +987,14 @@ pub async fn label_unprocessed(
         let id = format!("id:{id}");
         let files = nm.files(&id)?;
         // Only process the first file path is multiple files have the same id
-        let path = files.iter().next().unwrap();
+        let Some(path) = files.iter().next() else {
+            error!("No files for message-ID {id}");
+            let t = "Letterbox/Bad";
+            nm.tag_add(t, &id)?;
+            let t = "unprocessed";
+            nm.tag_remove(t, &id)?;
+            continue;
+        };
         let file = File::open(&path)?;
         info!("parsing {path}");
         let mmap = unsafe { MmapOptions::new().map(&file)? };