Recurrent error "setScopes() must be of the type array"

NC 18.0.3 / Ubuntu 18.04.4 / Apache2

Hi, I can see in the log every 5’’ this message:

Exception: Argument 1 passed to OCA\WorkflowEngine\Helper\LogContext::setScopes() must be of the type array, object given, called in /var/www/nextcloud/apps/workflowengine/lib/Service/RuleMatcher.php on line 146

0. /var/www/nextcloud/lib/private/AppFramework/App.php - line 125:OC\AppFramework\Http\Dispatcher->dispatch()
1. /var/www/nextcloud/lib/private/AppFramework/Routing/RouteActionHandler.php - line 47:OC\AppFramework\App::main()
2. <<closure>>OC\AppFramework\Routing\RouteActionHandler->__invoke()
3. /var/www/nextcloud/lib/private/Route/Router.php - line 299:call_user_func()
4. /var/www/nextcloud/lib/base.php - line 1008:OC\Route\Router->match()
5. /var/www/nextcloud/index.php - line 38:OC::handleRequest()

Causé parTypeError: Argument 1 passed to OCA\WorkflowEngine\Helper\LogContext::setScopes() must be of the type array, object given, called in /var/www/nextcloud/apps/workflowengine/lib/Service/RuleMatcher.php on line 146

0. /var/www/nextcloud/apps/workflowengine/lib/Service/RuleMatcher.php - line 146:OCA\WorkflowEngine\Helper\LogContext->setScopes()
1. /var/www/nextcloud/apps/workflowengine/lib/Service/RuleMatcher.php - line 114:OCA\WorkflowEngine\Service\RuleMatcher->getMatchingOperations()
2. /var/www/nextcloud/apps/workflow_pdf_converter/lib/Operation.php - line 110:OCA\WorkflowEngine\Service\RuleMatcher->getFlows()
3. /var/www/nextcloud/apps/workflowengine/lib/AppInfo/Application.php - line 114:OCA\WorkflowPDFConverter\Operation->onEvent()
4. /var/www/nextcloud/3rdparty/symfony/event-dispatcher/EventDispatcher.php - line 247:OCA\WorkflowEngine\AppInfo\Application->OCA\WorkflowEngine\AppInfo\{closure}("*** sensiti ... *")
5. /var/www/nextcloud/3rdparty/symfony/event-dispatcher/EventDispatcher.php - line 73:Symfony\Component\EventDispatcher\EventDispatcher->callListeners()
6. /var/www/nextcloud/lib/private/EventDispatcher/EventDispatcher.php - line 80:Symfony\Component\EventDispatcher\EventDispatcher->dispatch()
7. /var/www/nextcloud/lib/private/EventDispatcher/SymfonyAdapter.php - line 63:OC\EventDispatcher\EventDispatcher->dispatch()
8. /var/www/nextcloud/lib/private/Files/Node/HookConnector.php - line 95:OC\EventDispatcher\SymfonyAdapter->dispatch()
9. /var/www/nextcloud/lib/private/legacy/hook.php - line 111:OC\Files\Node\HookConnector->postWrite()
10. /var/www/nextcloud/lib/private/Files/View.php - line 1275:OC_Hook::emit()
11. /var/www/nextcloud/lib/private/Files/View.php - line 1203:OC\Files\View->runHooks()
12. /var/www/nextcloud/lib/private/Files/View.php - line 694:OC\Files\View->basicOperation()
13. /var/www/nextcloud/lib/private/Files/Node/File.php - line 71:OC\Files\View->file_put_contents()
14. /var/www/nextcloud/apps/files_mindmap/lib/Controller/FileHandlingController.php - line 132:OC\Files\Node\File->putContent()
15. /var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 170:OCA\Files_MindMap\Controller\FileHandlingController->save()
16. /var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 99:OC\AppFramework\Http\Dispatcher->executeController()
17. /var/www/nextcloud/lib/private/AppFramework/App.php - line 125:OC\AppFramework\Http\Dispatcher->dispatch()
18. /var/www/nextcloud/lib/private/AppFramework/Routing/RouteActionHandler.php - line 47:OC\AppFramework\App::main()
19. <<closure>>OC\AppFramework\Routing\RouteActionHandler->__invoke()
20. /var/www/nextcloud/lib/private/Route/Router.php - line 299:call_user_func()
21. /var/www/nextcloud/lib/base.php - line 1008:OC\Route\Router->match()
22. /var/www/nextcloud/index.php - line 38:OC::handleRequest()

Any idea about what to do to correct it?

Scheduled for 18.0.4.

Thanks @kesselb