500 error when using Test Block Components

Overview

500 error when using Test Block Components: $client_model must be of type array, null given.

While testing with the Test Block Components module enabled, I encountered a server error and the UI fails to load as expected.

Please see the attached video for a demonstration of the error.

Console error:

{
    "status": 500,
    "data": {
        "message": "Drupal\\experience_builder\\Plugin\\ExperienceBuilder\\ComponentSource\\BlockComponent::clientModelToInput(): Argument #3 ($client_model) must be of type array, null given, called in /var/www/html/web/modules/contrib/experience_builder/src/Form/ComponentInputsForm.php on line 102",
        "file": "/var/www/html/web/modules/contrib/experience_builder/src/Plugin/ExperienceBuilder/ComponentSource/BlockComponent.php",
        "line": 403,
        "trace": [
            {
                "file": "/var/www/html/web/modules/contrib/experience_builder/src/Form/ComponentInputsForm.php",
                "line": 102,
                "function": "clientModelToInput",
                "class": "Drupal\\experience_builder\\Plugin\\ExperienceBuilder\\ComponentSource\\BlockComponent",
                "type": "->"
            },
        ]
    }
}

The error message indicates that $client_model is null when an array is expected in BlockComponent.php.

This occurs when interacting with the Experience Builder UI while the Test Block Components module is enabled.

Proposed resolution

User interface changes