1 files changed, 2 insertions, 1 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 7921e1d9d59c..5bf4c39e2ad6 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1089,7 +1089,8 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
                 btrfs_set_node_ptr_generation(parent, parent_slot,
                                               trans->transid);
                 btrfs_mark_buffer_dirty(parent);
-                tree_mod_log_free_eb(root->fs_info, buf);
+                if (last_ref)
+                        tree_mod_log_free_eb(root->fs_info, buf);
                 btrfs_free_tree_block(trans, root, buf, parent_start,
                                       last_ref);
         }