From 7a9ce6cd6e57d371ce4a512f74f5ad6d70c556a1 Mon Sep 17 00:00:00 2001
From: Linus Nordberg <linus@nordberg.se>
Date: Wed, 10 Sep 2014 09:17:02 +0200
Subject: Handle empty tree.

---
 src/ht.erl | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src')

diff --git a/src/ht.erl b/src/ht.erl
index bcd9421..3af71f8 100644
--- a/src/ht.erl
+++ b/src/ht.erl
@@ -103,6 +103,8 @@ add(#history_tree{version = V, store = Store}, Entry) ->
 
 tree_hash(Tree) ->
     tree_hash(Tree, Tree#history_tree.version).
+tree_hash(_, -1) ->
+    hash("");
 tree_hash(Tree, Version) ->
     get_hash(Tree, Version, {0, depth(Tree) - 1}).
 
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