diff --git a/app/controllers/issues_controller.rb b/app/controllers/issues_controller.rb
index a6a4cb734..031ca5ff4 100644
--- a/app/controllers/issues_controller.rb
+++ b/app/controllers/issues_controller.rb
@@ -27,7 +27,7 @@ class IssuesController < ApplicationController
     @issue = Issue.new(params[:issue])
     @issue.user_id = @user_id
     @issue.project_id = @project.id
-    if @issue.save!
+    if @issue.save
       flash[:notice] = I18n.t("flash.issue.saved")
       redirect_to project_issues_path(@project)
     else
diff --git a/app/models/issue.rb b/app/models/issue.rb
index 586175b89..78b41a8b0 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -7,7 +7,7 @@ class Issue < ActiveRecord::Base
   has_many :comments, :as => :commentable
   has_many :subscribes, :as => :subscribeable
 
-  validates :title, :body, :project_id, :user_id, :presence => true
+  validates :title, :body, :project_id, :presence => true
 
   #attr_readonly :serial_id
 
@@ -17,6 +17,10 @@ class Issue < ActiveRecord::Base
   after_create :deliver_issue_assign_notification
   after_update :deliver_issue_assign_notification
 
+  def assign_uname
+    user.uname if user
+  end
+
   protected
 
   def set_serial_id
@@ -52,7 +56,7 @@ class Issue < ActiveRecord::Base
 
   def collect_recipient_ids
     recipients = self.project.relations.by_role('admin').where(:object_type => 'User').map { |rel| rel.read_attribute(:object_id) }
-    recipients = recipients | [self.user_id]
+    recipients = recipients | [self.user_id] if self.user_id
     recipients = recipients | [self.project.owner_id] if self.project.owner_type == 'User'
     recipients
   end
diff --git a/app/views/issues/_list.html.haml b/app/views/issues/_list.html.haml
index 41ec58acc..7415a221e 100644
--- a/app/views/issues/_list.html.haml
+++ b/app/views/issues/_list.html.haml
@@ -9,7 +9,7 @@
       %td
         = link_to issue.title, show_issue_path(@project, issue.serial_id)
       %td
-        = link_to issue.user.uname, user_path(issue.user)
+        = link_to issue.user.uname, user_path(issue.user) if issue.user
       %td
         = issue.status
       %td.last