Automation Widget Fatal Error (TypeError: int + string)

[MichaelJ]

I updated my WHMCS to 9.0.2 and I get this error when I login to WHMCS admin dashboard.

How to fix that?
 

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TypeError: Unsupported operand types: int + string in /home/exampleuser/example.com/modules/widgets/Automation.php:56

Stack trace:
#0 /home/exampleuser/example.com/vendor/whmcs/whmcs-foundation/lib/Module/AbstractWidget.php(0): WHMCS\Module\Widget\Automation->generateOutput()
#1 /home/exampleuser/whmcsdata/templates_c/example_file_homepage.tpl.php(151): WHMCS\Module\AbstractWidget->render()
#2 /home/exampleuser/example.com/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_xxx()
#3 /home/exampleuser/example.com/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode()
#4 /home/exampleuser/example.com/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render()
#5 /home/exampleuser/example.com/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php(238): Smarty_Internal_Template->render()
#6 /home/exampleuser/example.com/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php(116): Smarty_Internal_TemplateBase->_execute()
#7 /home/exampleuser/example.com/vendor/whmcs/whmcs-foundation/lib/Smarty.php(0): Smarty_Internal_TemplateBase->fetch()
#8 /home/exampleuser/example.com/vendor/whmcs/whmcs-foundation/lib/Admin.php(0): WHMCS\Smarty->fetch()
#9 /home/exampleuser/example.com/vendor/whmcs/whmcs-foundation/lib/Admin.php(0): WHMCS\Admin->output()
#10 /home/exampleuser/example.com/vendor/whmcs/whmcs-foundation/lib/Admin/Controller/HomepageController.php(0): WHMCS\Admin->display()
#11 [internal function]: WHMCS\Admin\Controller\HomepageController->index()
#12 /home/exampleuser/example.com/vendor/middlewares/utils/src/CallableHandler.php(68): call_user_func_array()
#13 /home/exampleuser/example.com/vendor/middlewares/utils/src/CallableHandler.php(38): Middlewares\Utils\CallableHandler->execute()
#14 /home/exampleuser/example.com/vendor/whmcs/whmcs-foundation/lib/Route/Middleware/Adapters/PsrRouterStack.php(0): Middlewares\Utils\CallableHandler->handle()
#15 /home/exampleuser/example.com/vendor/whmcs/whmcs-foundation/lib/Route/Middleware/Adapters/PsrRouterStack.php(0): WHMCS\Route\Middleware\Adapters\PsrRouterStack->executeHandler()
...
#140 {main}