Field data array cannot be retrieved from form array by field name.

Problem/Motivation

TypeError: Drupal\conditional_fields\ConditionalFieldsFormHelper::elementAddProperty(): Argument #1 ($element) must be of type array, null given, called in /app/docroot/modules/contrib/conditional_fields/src/ConditionalFieldsFormHelper.php on line 194 in Drupal\conditional_fields\ConditionalFieldsFormHelper->elementAddProperty() (line 843 of modules/contrib/conditional_fields/src/ConditionalFieldsFormHelper.php).
Drupal\conditional_fields\ConditionalFieldsFormHelper->processDependeeFields(Array, NULL, Array, Array) (Line: 111)
Drupal\conditional_fields\ConditionalFieldsFormHelper->processDependentFields() (Line: 85)
Drupal\conditional_fields\ConditionalFieldsFormHelper->afterBuild(Array, Object) (Line: 187)
conditional_fields_form_after_build(Array, Object)
call_user_func_array('conditional_fields_form_after_build', Array) (Line: 1084)