Can't add fee to an event or contribution page in update mode.

/var/www/html/civicrm-stable-4.7/CRM/Core/Error.php(374): CRM_Core_Error:
:backtrace()
#1 /var/www/html/civicrm-stable-4.7/CRM/Core/DAO.php(1070): CRM_Core_Error::fatal()
#2 /var/www/html/civicrm-stable-4.7/CRM/Price/BAO/PriceFieldValue.php(65): CRM_Core_DAO::getFieldValue
("CRM_Price_BAO_PriceFieldValue", NULL, "price_field_id")
#3 /var/www/html/civicrm-stable-4.7/CRM/Price/BAO/PriceFieldValue.php(127): CRM_Price_BAO_PriceFieldValue
::add((Array:3), (Array:1))
#4 /var/www/html/civicrm-stable-4.7/CRM/Price/BAO/PriceField.php(184): CRM_Price_BAO_PriceFieldValue
::create((Array:3), (Array:1))
#5 /var/www/html/civicrm-stable-4.7/CRM/Event/Form/ManageEvent/Fee.php(670): CRM_Price_BAO_PriceField
::create((Array:9))
#6 /var/www/html/civicrm-stable-4.7/CRM/Core/Form.php(447): CRM_Event_Form_ManageEvent_Fee->postProcess
()
#7 /var/www/html/civicrm-stable-4.7/CRM/Core/QuickForm/Action/Upload.php(169): CRM_Core_Form->mainProcess
()
#8 /var/www/html/civicrm-stable-4.7/CRM/Core/QuickForm/Action/Upload.php(136): CRM_Core_QuickForm_Action_Upload-
>realPerform(Object(CRM_Event_Form_ManageEvent_Fee), "upload")
#9 /var/www/html/civicrm-stable-4.7/packages/HTML/QuickForm/Controller.php(203): CRM_Core_QuickForm_Action_Upload-
>perform(Object(CRM_Event_Form_ManageEvent_Fee), "upload")
#10 /var/www/html/civicrm-stable-4.7/packages/HTML/QuickForm/Page.php(103): HTML_QuickForm_Controller-
>handle(Object(CRM_Event_Form_ManageEvent_Fee), "upload")
#11 /var/www/html/civicrm-stable-4.7/CRM/Core/Controller.php(351): HTML_QuickForm_Page->handle(&quot
;upload")
#12 /var/www/html/civicrm-stable-4.7/CRM/Utils/Wrapper.php(113): CRM_Core_Controller->run()
#13 /var/www/html/civicrm-stable-4.7/CRM/Core/Invoke.php(284): CRM_Utils_Wrapper->run("CRM_Event_Form_ManageEvent_Fee
", "Event Fees", NULL)
#14 /var/www/html/civicrm-stable-4.7/CRM/Core/Invoke.php(84): CRM_Core_Invoke::runItem((Array:14))
#15 /var/www/html/civicrm-stable-4.7/CRM/Core/Invoke.php(52): CRM_Core_Invoke::_invoke((Array:4))
#16 /var/www/html/civicrm-stable-4.7/drupal/civicrm.module(448): CRM_Core_Invoke::invoke((Array:4))
#17 [internal function](): civicrm_invoke("event", "manage", "fee")
#18 /var/www/html/drupal-stable-4.7/includes/menu.inc(527): call_user_func_array("civicrm_invoke
", (Array:3))
#19 /var/www/html/drupal-stable-4.7/index.php(21): menu_execute_active_handler()
#20 {main}