diff --git a/src/query/plan/operator.cpp b/src/query/plan/operator.cpp
index 519da233f..e20a519f2 100644
--- a/src/query/plan/operator.cpp
+++ b/src/query/plan/operator.cpp
@@ -918,7 +918,7 @@ ExpandBreadthFirst::ExpandBreadthFirst(
       inner_node_symbol_(inner_node_symbol),
       inner_edge_symbol_(inner_edge_symbol),
       where_(where),
-      input_(input),
+      input_(input ? input : std::make_shared<Once>()),
       input_symbol_(input_symbol),
       existing_node_(existing_node),
       graph_view_(graph_view) {}