diff --git a/mini-lsm-mvcc/src/lsm_iterator.rs b/mini-lsm-mvcc/src/lsm_iterator.rs
index ad32424..36a87bf 100644
--- a/mini-lsm-mvcc/src/lsm_iterator.rs
+++ b/mini-lsm-mvcc/src/lsm_iterator.rs
@@ -136,14 +136,14 @@ impl<I: StorageIterator> StorageIterator for FusedIterator<I> {
     }
 
     fn key(&self) -> Self::KeyType<'_> {
-        if self.has_errored || !self.iter.is_valid() {
+        if !self.is_valid() {
             panic!("invalid access to the underlying iterator");
         }
         self.iter.key()
     }
 
     fn value(&self) -> &[u8] {
-        if self.has_errored || !self.iter.is_valid() {
+        if !self.is_valid() {
             panic!("invalid access to the underlying iterator");
         }
         self.iter.value()