From 50817c3d641c29207ed1c3b565c85dcf82e10767 Mon Sep 17 00:00:00 2001
From: sw <939547590@qq.com>
Date: Tue, 22 Sep 2015 16:52:21 +0800
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---
 app/models/student_work_test.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/models/student_work_test.rb b/app/models/student_work_test.rb
index 1cfb7f8b2..0246ecabf 100644
--- a/app/models/student_work_test.rb
+++ b/app/models/student_work_test.rb
@@ -45,7 +45,7 @@ class StudentWorkTest < ActiveRecord::Base
   private
   def get_success_count
     self.results.inject(0) do |sum, result|
-      sum += (result["status"].to_i == 0 ? 1 : 0)
+      sum += (result["status"] && result["status"].to_i == 0 ? 1 : 0)
     end || 0
   end