diff --git a/app/controllers/account_controller.rb b/app/controllers/account_controller.rb
index c05d1172c..c1b38fa39 100644
--- a/app/controllers/account_controller.rb
+++ b/app/controllers/account_controller.rb
@@ -140,6 +140,15 @@ class AccountController < ApplicationController
           @user.password, @user.password_confirmation = user_params[:password], user_params[:password_confirmation]
         end
 
+        if(@cache_identityy == "")
+          flash.now[:error]= l(:label_identity)+l(:'activerecord.errors.messages.empty')
+          return
+        end
+        if(@cache_city == "")
+          flash.now[:error]= l(:label_location)+l(:'activerecord.errors.messages.empty')
+          return
+        end
+
         case Setting.self_registration
         when '1'
           register_by_email_activation(@user)
diff --git a/app/models/repository.rb b/app/models/repository.rb
index 57a818270..c2736dd30 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -42,7 +42,7 @@ class Repository < ActiveRecord::Base
   validates_uniqueness_of :identifier, :scope => :project_id, :allow_blank => true
   validates_exclusion_of :identifier, :in => %w(show entry raw changes annotate diff show stats graph)
   # donwcase letters, digits, dashes, underscores but not digits only
-  validates_format_of :identifier, :with => /^[a-zA-Z0-9_\-]+$/, :allow_blank => true
+  validates_format_of :identifier, :with => /^[a-z0-9_\-]+$/, :allow_blank => true
   # Checks if the SCM is enabled when creating a repository
   validate :repo_create_validation, :on => :create
 
diff --git a/app/views/courses/show.html.erb b/app/views/courses/show.html.erb
index deb590d1f..d7d579dd1 100644
--- a/app/views/courses/show.html.erb
+++ b/app/views/courses/show.html.erb
@@ -1,4 +1,4 @@
-<% if @events_by_day.size >0 %>
+<% if @events_by_day != nil && @events_by_day.size >0 %>
     <div class="content-title-top-avtive">
       <!-- <h3><%= @author.nil? ? l(:label_activity) : l(:label_user_activity, link_to_user(@author)).html_safe %></h3> -->
       <p class="subtitle">