CustomValue CREATE API 3 - wrong param order

civicrm_api3_custom_value_create calls CRM_Core_BAO_CustomField::getCustomFieldID($i, $n) to get custom field ID (line 92).
$i - supposed to be group name
$n - field name

getCustomFieldID accepts parameters in this order: $fieldName, $groupName.

Solution - call the method with parementers with reversed order:
// Lookup names if ID was not supplied
$key = CRM_Core_BAO_CustomField::getCustomFieldID($n, $i);