diff --git a/server/src/vbox.rs b/server/src/vbox.rs
index 3b49d27a..8df14c6d 100644
--- a/server/src/vbox.rs
+++ b/server/src/vbox.rs
@@ -171,7 +171,9 @@ impl Vbox {
 
         self.bound.push(combo.item);
         // self.bound.sort_unstable();
-
+        if self.bound.len() >= 10 {
+            return Err(err_msg("too many items bound"));
+        }
         Ok(self)
     }
 }