diff --git a/packages/core/src/scopes.rs b/packages/core/src/scopes.rs
index 5601d57fe..5d1c661c0 100644
--- a/packages/core/src/scopes.rs
+++ b/packages/core/src/scopes.rs
@@ -591,6 +591,8 @@ impl<'src> ScopeState {
                         propagates: event.propagates,
                         data,
                     });
+                } else {
+                    println!("Failed to downcast event data")
                 }
             }))
         };