1 files changed, 6 insertions, 2 deletions
diff --git a/merge.c b/merge.c
index ca89b312d1..752a937fa9 100644
--- a/merge.c
+++ b/merge.c
@@ -77,8 +77,12 @@ int checkout_fast_forward(struct repository *r,
 		return -1;
 	}
 	for (i = 0; i < nr_trees; i++) {
-		parse_tree(trees[i]);
-		init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
+		if (parse_tree(trees[i]) < 0) {
+			rollback_lock_file(&lock_file);
+			return -1;
+		}
+		init_tree_desc(t+i, &trees[i]->object.oid,
+			       trees[i]->buffer, trees[i]->size);
 	}
 
 	memset(&opts, 0, sizeof(opts));