diff --git a/app/views/admin/code_work_tests.html.erb b/app/views/admin/code_work_tests.html.erb
index 9fbd2fa46..29fb588c2 100644
--- a/app/views/admin/code_work_tests.html.erb
+++ b/app/views/admin/code_work_tests.html.erb
@@ -39,53 +39,55 @@
     <% @code_work_tests.each do |test| %>
         <% infos = StudentWorkTest.find_by_sql("select a.homework_common_id as homeworkid,b.language from student_works as a, homework_detail_programings as b where a.id = #{test.student_work_id} and a.homework_common_id = b.homework_common_id
   ").first %>
-        <tr class="<%= cycle("odd", "even") %>">
-          <td style="text-align: center; " title='<%=infos.homeworkid%>'>
-            <%=link_to(infos.homeworkid, student_work_index_path(:homework => infos.homeworkid))%>
-          </td>
-          <td style="text-align: center;">
-                <% if test.status != -2 && test.results.first['user_wait'] %>
-                    <% wait_time = 0  %>
-                    <% test.results.each do |result|  wait_time = wait_time + result['user_wait']  end %>
-                    <%=(wait_time/test.results.count).to_s+"毫秒" %>
+        <% if infos != nil %>
+            <tr class="<%= cycle("odd", "even") %>">
+              <td style="text-align: center; " title='<%=infos.homeworkid%>'>
+                <%=link_to(infos.homeworkid, student_work_index_path(:homework => infos.homeworkid))%>
+              </td>
+              <td style="text-align: center;">
+                    <% if test.status != -2 && test.results.first['user_wait'] %>
+                        <% wait_time = 0  %>
+                        <% test.results.each do |result|  wait_time = wait_time + result['user_wait']  end %>
+                        <%=(wait_time/test.results.count).to_s+"毫秒" %>
+                    <% else %>
+                        <%="未记录"%>
+                    <% end %>
+              </td>
+              <td align="center">
+                <%=%W(C C++ Python Java).at(infos.language.to_i - 1)%>
+              </td>
+              <td align="center">
+                <%=Time.parse(test.created_at.to_s).strftime("%Y-%m-%d %H:%M:%S")%>
+              </td>
+              <td align="center">
+                <% if test.status == 0 %>
+                    <%= "答题正确" %>
+                <% elsif test.status == -2 %>
+                    <%= "编译错误" %>
+                <% elsif test.status == 2 || test.results.last['status'] == 2 %>
+                    <%= "超时" %>
                 <% else %>
-                    <%="未记录"%>
+                    <%= "答题错误" %>
                 <% end %>
-          </td>
-          <td align="center">
-            <%=%W(C C++ Python Java).at(infos.language.to_i - 1)%>
-          </td>
-          <td align="center">
-            <%=Time.parse(test.created_at.to_s).strftime("%Y-%m-%d %H:%M:%S")%>
-          </td>
-          <td align="center">
-            <% if test.status == 0 %>
-                <%= "答题正确" %>
-            <% elsif test.status == -2 %>
-                <%= "编译错误" %>
-            <% elsif test.status == 2 || test.results.last['status'] == 2 %>
-                <%= "超时" %>
-            <% else %>
-                <%= "答题错误" %>
-            <% end %>
-          </td>
-          <td class="center">
-            <% if test.status != -2 %>
-               <%=test.results.count%>
-            <% end %>
-          </td>
-          <td class="center">
-            <% if test.status != -2 %>
-                <%test.results = test.results.sort_by {|result| result['time_used'] }%>
-                <%=test.results.first['time_used'] == 0 ? "1毫秒":test.results.first['time_used'].to_s+"毫秒"%>
-            <% end %>
-          </td>
-          <td class="center">
-            <% if test.status != -2 %>
-                <%=test.results.last['time_used'] == 0 ? "1毫秒":test.results.last['time_used'].to_s+"毫秒"%>
-            <% end %>
-          </td>
-        </tr>
+              </td>
+              <td class="center">
+                <% if test.status != -2 %>
+                   <%=test.results.count%>
+                <% end %>
+              </td>
+              <td class="center">
+                <% if test.status != -2 %>
+                    <%test.results = test.results.sort_by {|result| result['time_used'] }%>
+                    <%=test.results.first['time_used'] == 0 ? "1毫秒":test.results.first['time_used'].to_s+"毫秒"%>
+                <% end %>
+              </td>
+              <td class="center">
+                <% if test.status != -2 %>
+                    <%=test.results.last['time_used'] == 0 ? "1毫秒":test.results.last['time_used'].to_s+"毫秒"%>
+                <% end %>
+              </td>
+            </tr>
+        <% end %>
     <% end %>
     </tbody>
   </table>