diff --git a/app/controllers/issues_controller.rb b/app/controllers/issues_controller.rb
index cc9f70e4b..fc0279417 100644
--- a/app/controllers/issues_controller.rb
+++ b/app/controllers/issues_controller.rb
@@ -350,7 +350,7 @@ class IssuesController < ApplicationController
     
     respond_to do |format|
       format.html { render :template => "issues/gantt.rhtml", :layout => !request.xhr? }
-      format.png  { send_data(@gantt.to_image, :disposition => 'inline', :type => 'image/png', :filename => "#{@project.identifier}-gantt.png") } if @gantt.respond_to?('to_image')
+      format.png  { send_data(@gantt.to_image, :disposition => 'inline', :type => 'image/png', :filename => "#{@project.nil? ? '' : "#{@project.identifier}-" }gantt.png") } if @gantt.respond_to?('to_image')
       format.pdf  { send_data(gantt_to_pdf(@gantt, @project), :type => 'application/pdf', :filename => "#{@project.nil? ? '' : "#{@project.identifier}-" }gantt.pdf") }
     end
   end