diff --git a/src/data_source.rs b/src/data_source.rs
index 916354a..93963a5 100644
--- a/src/data_source.rs
+++ b/src/data_source.rs
@@ -70,6 +70,7 @@ pub trait DataSource {
         );
         let data = self.get_champ_data_with_win_pourcentage(champ, positions, client);
 
+        let mut missing_roles = vec![];
         for pos in positions {
             let mut ok = false;
             for build in &data {
@@ -79,14 +80,17 @@ pub trait DataSource {
                 }
             }
             if !ok {
-                error!(
-                    "{}: Can't get data for {} at {}",
-                    self.get_alias(),
-                    champ.id,
-                    pos
-                );
+                missing_roles.push(pos.to_owned());
             }
         }
+        if !missing_roles.is_empty() {
+            error!(
+                "{}: Can't get data for {} at {}",
+                self.get_alias(),
+                champ.id,
+                missing_roles.join(", ")
+            );
+        }
 
         for build in data {
             let item_set = ItemSet {