diff --git a/commonclient/iterator.go b/commonclient/iterator.go
index 0bdd68c..a46eab8 100644
--- a/commonclient/iterator.go
+++ b/commonclient/iterator.go
@@ -29,6 +29,10 @@ func ReadIteratorItems(inv Invoker, batchSize int, contract util.Uint160, method
 		return arr, nil
 	}
 
+	defer func() {
+		_ = inv.TerminateSession(sessionID)
+	}()
+
 	var shouldStop bool
 	res := arr
 	for !shouldStop {