diff --git a/src/cursor.c b/src/cursor.c
index b313a78f..036ab123 100644
--- a/src/cursor.c
+++ b/src/cursor.c
@@ -1408,6 +1408,7 @@ insert_node:;
           data[0].iov_base = ptr_disp(data[0].iov_base, data[0].iov_len);
           insert_key = insert_data = false;
           old_singledup.iov_base = nullptr;
+          sub_root = nullptr;
           goto more;
         }
       }