diff --git a/src/api/mod.rs b/src/api/mod.rs
index f72d633..b016ecc 100644
--- a/src/api/mod.rs
+++ b/src/api/mod.rs
@@ -51,6 +51,9 @@ pub async fn pdf() -> impl IntoResponse {
 
 async fn download_pdf(id: u8) -> Result<String, Error> {
     let links = get_pdf_links().await.unwrap();
+    if id as usize >= links.len() {
+        return Err(failure::err_msg("Invalid ID"));
+    }
     let url = &links[id as usize];
 
     let mut hasher = Sha1::new();
@@ -92,7 +95,15 @@ pub struct Header {
 }
 
 pub async fn get_classes(Query(params): Query<FilterByTeacherQuery>) -> impl IntoResponse {
-    let filename = download_pdf(params.id).await.unwrap();
+    let filename = match download_pdf(params.id).await {
+        Ok(x) => x,
+        Err(_) => {
+            return (
+                StatusCode::UNPROCESSABLE_ENTITY,
+                Json(json!({ "errore": "ID non valido"})),
+            )
+        }
+    };
     let csv_content = fs::read_to_string(&filename).unwrap();
 
     let mut rdr = csv::Reader::from_reader(csv_content.as_bytes());
@@ -126,7 +137,15 @@ pub struct FilterByClassQuery {
 }
 
 pub async fn get_teachers(Query(params): Query<FilterByClassQuery>) -> impl IntoResponse {
-    let filename = download_pdf(params.id).await.unwrap();
+    let filename = match download_pdf(params.id).await {
+        Ok(x) => x,
+        Err(_) => {
+            return (
+                StatusCode::UNPROCESSABLE_ENTITY,
+                Json(json!({ "errore": "ID non valido"})),
+            )
+        }
+    };
     let csv_content = fs::read_to_string(&filename).unwrap();
 
     let mut rdr = csv::Reader::from_reader(csv_content.as_bytes());
@@ -135,7 +154,15 @@ pub async fn get_teachers(Query(params): Query<FilterByClassQuery>) -> impl Into
     let mut result: HashMap<String, Vec<String>> = HashMap::new();
 
     for record in rdr.records() {
-        let record = record.unwrap();
+        let record = match record {
+            Ok(x) => x,
+            Err(_) => {
+                return (
+                    StatusCode::UNPROCESSABLE_ENTITY,
+                    Json(json!({ "errore": "Formato non supportato"})),
+                )
+            }
+        };
         for (i, cell) in record.iter().enumerate() {
             if cell == params.classe {
                 for (day, range) in header.weekdays.clone() {