diff --git a/lib/redmine/scm/adapters/mercurial_adapter.rb b/lib/redmine/scm/adapters/mercurial_adapter.rb
index d02ed78b0..c84e5d3ca 100644
--- a/lib/redmine/scm/adapters/mercurial_adapter.rb
+++ b/lib/redmine/scm/adapters/mercurial_adapter.rb
@@ -276,7 +276,8 @@ module Redmine
           end
           blame
         rescue HgCommandAborted
-          nil  # means not found or cannot be annotated
+          # means not found or cannot be annotated
+          Annotate.new
         end
 
         class Revision < Redmine::Scm::Adapters::Revision