diff --git a/src/binder/drop.rs b/src/binder/drop.rs
index 02368f194..43779892c 100644
--- a/src/binder/drop.rs
+++ b/src/binder/drop.rs
@@ -75,7 +75,7 @@ impl Binder {
                     cascade,
                 })))
             }
-            _ => todo!(),
+            _ => Err(BindError::UnsupportedObjectName(object_type)),
         }
     }
 }
diff --git a/src/binder/mod.rs b/src/binder/mod.rs
index 9c98d0b40..87db6b1cd 100644
--- a/src/binder/mod.rs
+++ b/src/binder/mod.rs
@@ -85,6 +85,8 @@ pub enum BindError {
     NotSupportedOnInternalTable,
     #[error("{0:?} is not an aggregate function")]
     NotAgg(String),
+    #[error("unsupported object name: {0:?}")]
+    UnsupportedObjectName(ObjectType),
     #[error("not supported yet: {0}")]
     Todo(String),
 }