Prevent array_key_exists(): Argument #2 ($array) must be of type array, null given Error in Varbase Dashboards Block

Problem/Motivation

When rendering a Canvas page while the Varbase dashboards module is enabled, the following error appears on the page:

An unexpected error has occurred while fetching components.
Error 500: array_key_exists(): Argument #2 ($array) must be of type array, null given
file: /var/www/html/docroot/modules/contrib/varbase_dashboards/src/Plugin/Block/VarbaseContentOverview.php

As a result, Canvas pages fail to render properly, producing a PHP warning and a 500 error.

Steps to reproduce

1. Enable Varbase Dashboards & Canvas.
2. Visit the main /canvas/**.
3. Observe the PHP error in the components side or in the console.

Proposed resolution

Add a type check to ensure all variables are an array before calling array_key_exists().

Remaining tasks

• ✅ File an issue about this project
• ✅ Addition/Change/Update/Fix to this project
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ➖ UX/UI designer responsibilities
• ➖ Accessibility and Readability
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Update Release Notes and Update Helper on new feature change/addition
• ✅ Release varbase-10.1.0-beta1, varbase_dashboards-2.0.0-beta1

Varbase update type

• ✅ No Update
• ➖ Optional Update
• ➖ Forced Update
• ➖ Forced Update if Unchanged

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• [#3550904] fix: Prevent array_key_exists(): Argument #2 ($array) must be of type array, null given Error in Varbase Dashboards Block By: n.ghunaim