read-cache.c: do not die if mmap fails

diff --git a/commit.c b/commit.c
index a9e74647dc822606d06f79bcf94030b32998bd69..8fa1883c61c580578a755cdf2da009203d8d386e 100644 (file)
--- a/commit.c
+++ b/commit.c
@@ -351,10 +351,10 @@ struct tree *repo_get_commit_tree(struct repository *r,
        if (commit->maybe_tree || !commit->object.parsed)
                return commit->maybe_tree;
 
-       if (commit->graph_pos == COMMIT_NOT_FROM_GRAPH)
-               BUG("commit has NULL tree, but was not loaded from commit-graph");
+       if (commit->graph_pos != COMMIT_NOT_FROM_GRAPH)
+               return get_commit_tree_in_graph(r, commit);
 
-       return get_commit_tree_in_graph(r, commit);
+       return NULL;
 }
 
 struct object_id *get_commit_tree_oid(const struct commit *commit)