diff --git a/app/views/graph/show.json.erb b/app/views/graph/show.json.erb
index 529d584..9a62cdb 100644
--- a/app/views/graph/show.json.erb
+++ b/app/views/graph/show.json.erb
@@ -7,9 +7,9 @@
       {
         parents: parents_zip_spaces(c.parents(@graph.map), c.parent_spaces),
         author: {
-          name: c.author.name,
-          email: c.author.email,
-          icon: gravatar_icon(c.author.email, 20)
+          name: c.author_name,
+          email: c.author_email,
+          icon: gravatar_icon(c.author_email, 20)
         },
         time: c.time,
         space: c.spaces.first,
diff --git a/lib/gitlab/git/compare.rb b/lib/gitlab/git/compare.rb
index 1fa4306..e34f204 100644
--- a/lib/gitlab/git/compare.rb
+++ b/lib/gitlab/git/compare.rb
@@ -20,10 +20,8 @@ module Gitlab
           return
         end
 
-        @commit = Commit.new(first)
-
+        @commit = first
         @commits = repository.commits_between(last.id, first.id)
-        @commits = @commits.map { |c| Commit.new(c) }
 
         @diffs = if @commits.size > 100
                    []
--
libgit2 0.21.2