r-labs » Work Time

when I click edit relay tickets. it shows 500 error about [html_safe]. I used 0.2.3.

Started GET "/work_time/edit_relay/upnp?day=15&month=8&prj=false&user=39&year=2012" for 192.168.2.76 at Wed Aug 15 13:25:42 +0800 2012
Processing by WorkTimeController#edit_relay as HTML
Parameters: {"month"=>"8", "id"=>"upnp", "day"=>"15", "year"=>"2012", "prj"=>"false", "user"=>"39"}
Rendered plugins/redmine_work_time/app/views/work_time/_select_project.html.erb (195.0ms)
Rendered plugins/redmine_work_time/app/views/work_time/_relay_table.html.erb (127.4ms)
Rendered plugins/redmine_work_time/app/views/work_time/edit_relay.html.erb within layouts/base (326.4ms)
Completed 500 Internal Server Error in 707ms

ActionView::Template::Error (undefined method `html_safe' for nil:NilClass):
85: </td>
86: <td><%=cost.html_safe%></td>
87: <td><%=r_cost.html_safe%></td>
88: <td id="ticket<%=issue_id%>"> => <%=parentHtml.html_safe%>
89: <%
90: if User.current.allowed_to?(:edit_work_time_total, @project) then
91: if parent != "" then
plugins/redmine_work_time/app/views/work_time/_relay_table.html.erb:88:in `_plugins_redmine_work_time_app_views_work_time__relay_table_html_erb___1034083038__620561898'
plugins/redmine_work_time/app/views/work_time/_relay_table.html.erb:28:in `each'
plugins/redmine_work_time/app/views/work_time/_relay_table.html.erb:28:in `_plugins_redmine_work_time_app_views_work_time__relay_table_html_erb___1034083038__620561898'
plugins/redmine_work_time/app/views/work_time/_relay_table.html.erb:6:in `each'
plugins/redmine_work_time/app/views/work_time/_relay_table.html.erb:6:in `_plugins_redmine_work_time_app_views_work_time__relay_table_html_erb___1034083038__620561898'
actionpack (3.2.6) lib/action_view/template.rb:145:in `send'
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prototype-rails (3.2.1) lib/prototype-rails/rendering.rb:8:in `render'
plugins/redmine_work_time/app/views/work_time/edit_relay.html.erb:21:in `_plugins_redmine_work_time_app_views_work_time_edit_relay_html_erb___475391251__620690168'
actionpack (3.2.6) lib/action_view/template.rb:145:in `send'
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actionpack (3.2.6) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
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thin (1.4.1) bin/thin:6
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