新建的项目发布新问题报500

app/controllers/issues_controller.rb

@@ -154,7 +154,7 @@ class IssuesController < ApplicationController
     call_hook(:controller_issues_new_before_save, { :params => params, :issue => @issue })
     @issue.save_attachments(params[:attachments] || (params[:issue] && params[:issue][:uploads]))
     # 给该issue在它所在的项目中所有的issues中所在的位置给一个序号
-    @issue.project_issues_index = @issue.project.issues.last.project_issues_index + 1
+    @issue.project_issues_index = @issue.project.issues.last.nil? ? 1 : @issue.project.issues.last.project_issues_index + 1
     if @issue.save
       call_hook(:controller_issues_new_after_save, { :params => params, :issue => @issue})
       respond_to do |format|