When in a survey token table, tick boxes next to names and click the 'View Participants of this survey in the Central Participant Database panel' button. An error 500 is generated and the Firebug console gives:

<h1>PHP Error [8]</h1>
<p>Undefined offset: 1 (C:\limesurvey_train\application\models\Participants.php:747)</p>
<pre>#0 C:\limesurvey_train\application\models\Participants.php(747): LSYii_Application->handleError()
#1 C:\limesurvey_train\application\controllers\admin\participantsaction.php(783): Participants->getParticipantsSearchMultipleCondition()
#2 unknown(0): participantsaction->getParticipantsResults_json()
#3 C:\limesurvey_train\framework\web\actions\CAction.php(107): ReflectionMethod->invokeArgs()
#4 C:\limesurvey_train\application\core\Survey_Common_Action.php(100): participantsaction->runWithParamsInternal()
#5 C:\limesurvey_train\application\controllers\admin\participantsaction.php(51): participantsaction->runWithParams()
#6 C:\limesurvey_train\framework\web\CController.php(309): participantsaction->runWithParams()
#7 C:\limesurvey_train\framework\web\CController.php(287): AdminController->runAction()
#8 C:\limesurvey_train\framework\web\CController.php(266): AdminController->runActionWithFilters()
#9 C:\limesurvey_train\application\controllers\AdminController.php(170): AdminController->run()
#10 C:\limesurvey_train\framework\web\CWebApplication.php(276): AdminController->run()
#11 C:\limesurvey_train\framework\web\CWebApplication.php(135): LSYii_Application->runController()
#12 C:\limesurvey_train\framework\base\CApplication.php(162): LSYii_Application->processRequest()
#13 C:\limesurvey_train\index.php(178): LSYii_Application->run()
</pre>