How to repeat:

• go to configuration / actions
• pick event source: "Triggers"
• click "add action"
• observe error:

  Undefined index: formulaid [actionconf.php:453 ? CConditionHelper::sortConditionsByFormulaId() ? uasort() ? CConditionHelper::{closure}() in /include/classes/helpers/CConditionHelper.php:164]
  Undefined index: formulaid [actionconf.php:453 ? CConditionHelper::sortConditionsByFormulaId() ? uasort() ? CConditionHelper::{closure}() in /include/classes/helpers/CConditionHelper.php:164]
  uasort(): Array was modified by the user comparison function [actionconf.php:453 ? CConditionHelper::sortConditionsByFormulaId() ? uasort() in /include/classes/helpers/CConditionHelper.php:165]