添加非空判断

app/helpers/welcome_helper.rb

@@ -137,7 +137,7 @@ module WelcomeHelper
   #获取课程列表
   # add by nwb
   def find_miracle_course(sum=10, max_rate=7, school_id)
-    if User.current.user_extensions.school.nil? and school_id.nil?
+    if User.current.user_extensions.nil? && User.current.user_extensions.school.nil? and school_id.nil?
       Course.active.visible.
           joins(:memberships).
           group('members.course_id').

app/views/layouts/_base_header.html.erb

@@ -34,7 +34,7 @@
 	<div id="account">
 		<%= render_menu :account_menu -%>
 	</div>
-		<% if User.current.logged? -%>
+  <% if User.current.logged? -%>
 	<div id="loggedas">
 	<ul style="padding:0 0; margin:0 0;display:inline;">
 		<li style="padding:0 0; margin:0 0;display:inline;border-bottom: 0;" class="loggedas_li">