diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 6d66e5c..a4bbb85 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -3112,6 +3112,7 @@
 	BUG_ON(!path);
 
 	trans = btrfs_start_transaction(fs_info->tree_root, 0);
+	BUG_ON(IS_ERR(trans));
 
 	wc.trans = trans;
 	wc.pin = 1;