新增TODO时出现的问题

我新增TODO时，把所有该填的都填了，然后点击保存，就直接出现下面的错误，请问这是出现了什么错误？



ERROR: SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active. Consider using PDOStatement::fetchAll(). Alternatively, if your code is only ever going to run against mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute.

The sql is: SELECT title FROM zt_bug WHERE `id` = '1' AND zt_bug.company = '1'



in /usr/local/apache/htdocs/zentaopms_bjf/lib/dao/dao.class.php on line 387, last called by /usr/local/apache/htdocs/zentaopms_bjf/lib/dao/dao.class.php on 458 through function query.