diff --git a/app/services/games_service.rb b/app/services/games_service.rb
index 33988146..7f0e6df4 100644
--- a/app/services/games_service.rb
+++ b/app/services/games_service.rb
@@ -500,7 +500,7 @@ class GamesService
     game.update_column(:evaluate_count, (game.evaluate_count.to_i + 1))
     # 清空代码评测信息
     msg = game.run_code_message
-    msg.update_column(:status => 0, :message => "") if msg.present?
+    msg.update_attributes(:status => 0, :message => nil) if msg.present?
     # 更新时间是为了TPM端显示的更新，退出实训及访问实训的时候会更新
     myshixun.update_column(:updated_at, Time.now)