if (0 <= it->entry_count) {
struct object *obj = parse_object(it->sha1);
+ if (!obj) {
+ error("%s: invalid sha1 pointer in cache-tree",
+ sha1_to_hex(it->sha1));
+ return 1;
+ }
mark_reachable(obj, REACHABLE);
obj->used = 1;
if (obj->type != tree_type)