Warning: Undefined array key "#webform_depth"

Problem/Motivation

Warning: Undefined array key "#webform_depth" in Drupal\calculation_fields\Element\FormCalculationElement::findStepPageOfElement() (line 83 of modules/contrib/calculation_fields/src/Element/FormCalculationElement.php)

Steps to reproduce

In Wizard Webform: Create a Calculation Field of two numbers fields.
Drupal 10.4.1
PHP 8.3

Proposed resolution

Check if the array key "#webform_depth" exists.

Remaining tasks

Create a patch and Test.