Steps to reproduce:

1. Navigate to Configuration -> Actions -> Triggers.
2. Press Create action button to add a new action.
3. Switch to Operations tab.
4. Press New button to add a new operation.
5. Add two Operation conditions.
6. Press Remove button to remove the first operation condition.
7. Press New button again to add a new operation condition.

Result:

• The remaining operation condition has no value.
• The following error:

  Undefined offset: 1 [actionconf.php:775 → CView->render() → include() in include/views/configuration.action.edit.php:1126]
  

Expected:

• Operation condition value is preserved.
• No errors.