Fatal error registering for waitlist or approval required event

Enable waitlist or approval required and register participant.

Fatal - One of parameters (value: ) is not of the type Integer
#0 /Users/dgg/git/crm_v4.7/CRM/Core/Error.php(362): CRM_Core_Error::backtrace()
#1 /Users/dgg/git/crm_v4.7/CRM/Utils/Request.php(92): CRM_Core_Error::fatal("Could not find valid value for id")
#2 /Users/dgg/git/crm_v4.7/CRM/Event/StateMachine/Registration.php(52): CRM_Utils_Request::retrieve("id", "Positive", Object(CRM_Event_Controller_Registration), TRUE)
#3 /Users/dgg/git/crm_v4.7/CRM/Event/Controller/Registration.php(47): CRM_Event_StateMachine_Registration->__construct(Object(CRM_Event_Controller_Registration), TRUE)
#4 /Users/dgg/git/crm_v4.7/CRM/Core/Invoke.php(307): CRM_Event_Controller_Registration->__construct("Event Registration", TRUE, "null", NULL, "false")
#5 /Users/dgg/git/crm_v4.7/CRM/Core/Invoke.php(86): CRM_Core_Invoke::runItem((Array:15))
#6 /Users/dgg/git/crm_v4.7/CRM/Core/Invoke.php(54): CRM_Core_Invoke::_invoke((Array:3))
#7 /Users/dgg/git/crm_v4.7/drupal/civicrm.module(451): CRM_Core_Invoke::invoke((Array:3))
#8 [internal function](): civicrm_invoke("event", "register")
#9 /Users/dgg/htdocs/drupal7/includes/menu.inc(517): call_user_func_array("civicrm_invoke", (Array:2))
#10 /Users/dgg/htdocs/drupal7/index.php(21): menu_execute_active_handler()

Notice: Undefined index: priceSetId in CRM_Price_BAO_PriceSet::getAmountLevelText() (line 949 of/Users/dgg/git/crm_v4.7/CRM/Price/BAO/PriceSet.php).