diff --git a/lib/redmine/scm/adapters/mercurial_adapter.rb b/lib/redmine/scm/adapters/mercurial_adapter.rb
index 075636ce1b..6de4fe65a3 100644
--- a/lib/redmine/scm/adapters/mercurial_adapter.rb
+++ b/lib/redmine/scm/adapters/mercurial_adapter.rb
@@ -230,7 +230,7 @@ def each_revision(path=nil, identifier_from=nil, identifier_to=nil, options={})
                                    end
                                  ),
                                :time     => Time.parse(le['date']['__content__']),
-                               :message  => CGI.unescape(le['msg']['__content__']),
+                               :message  => CGI.unescape(le['msg']['__content__'] || ''),
                                :paths    => paths,
                                :parents  => parents_ary)
           end