From: Sven Verdoolaege <skimo@kotnet.org>

---
 builtin-read-tree.c |    9 ++++++---
 unpack-trees.c      |    3 +++
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/builtin-read-tree.c b/builtin-read-tree.c
index 929dd95..b9fcff7 100644
--- a/builtin-read-tree.c
+++ b/builtin-read-tree.c
@@ -17,9 +17,12 @@ static struct object_list *trees;
 
 static int list_tree(unsigned char *sha1)
 {
-	struct tree *tree = parse_tree_indirect(sha1);
-	if (!tree)
-		return -1;
+	struct tree *tree = NULL;
+	if (!is_null_sha1(sha1)) {
+		tree = parse_tree_indirect(sha1);
+		if (!tree)
+			return -1;
+	}
 	object_list_append(&tree->object, &trees);
 	return 0;
 }
diff --git a/unpack-trees.c b/unpack-trees.c
index e979bc5..30c2a49 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -26,6 +26,9 @@ static struct tree_entry_list *create_tree_entry_list(struct tree *tree)
 	struct tree_entry_list *ret = NULL;
 	struct tree_entry_list **list_p = &ret;
 
+	if (!tree)
+		return ret;
+
 	if (!tree->object.parsed)
 		parse_tree(tree);
 
-- 
1.5.2.rc3.783.gc7476-dirty

-
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