Unhandled System_Db_Exception:

Error below. Error went away after I changed a user to admin. System is full of these errors.
Unhandled System_Db_Exception: Prepared statement needs to be re-prepared in webissues2/webissues/system/db/mysqli/engine.inc.php on line 287
Stack trace:
#0 webissues2/webissues/system/db/mysqli/engine.inc.php(129): System_Db_Mysqli_Engine->handleError(Object(mysqli_stmt))
#1 webissues2/webissues/system/db/mysqli/engine.inc.php(90): System_Db_Mysqli_Engine->executeStatement('SELECT u.user_i...', Array)
#2 webissues2/webissues/system/db/connection.inc.php(256): System_Db_Mysqli_Engine->query('SELECT u.user_i...', Array)
#3 webissues2/webissues/system/db/connection.inc.php(289): System_Db_Connection->queryArgs('SELECT u.user_i...', Array)
#4 webissues2/webissues/system/db/connection.inc.php(277): System_Db_Connection->queryTableArgs('SELECT u.user_i...', Array)
#5 webissues2/webissues/system/api/alertmanager.inc.php(519): System_Db_Connection->queryTable('SELECT u.user_i...', 'email', 0, 2, 4, NULL, 6135)
#6 webissues2/webissues/cron/job.php(231): System_Api_AlertManager->getAlertRecipients(Array)
#7 webissues2/webissues/cron/job.php(72): Cron_Job->sendNotificationEmails()
#8 webissues2/webissues/system/core/application.inc.php(210): Cron_Job->execute()
#9 webissues2/webissues/system/bootstrap.inc.php(130): System_Core_Application->run()
#10 webissues2/webissues/cron/job.php(693): System_Bootstrap::run('Cron_Job')
#11 {main}