Warning: Invalid argument supplied for foreach() Observer.php on line 224

[borriglione]

In case meta_autogenerate is active, a warning occurs if no category was given.
There is no check before looping through empty category arrays.

exception 'Exception' with message 'Warning: Invalid argument supplied for foreach() in /home/shop/01/www/vendor/firegento/germansetup/src/app/code/community/FireGento/GermanSetup/Model/Observer.php on line 224' in /home/shop/01/www/app/code/core/Mage/Core/functions.php:245
Stack trace:
#0 /home/shop/01/www/vendor/firegento/germansetup/src/app/code/community/FireGento/GermanSetup/Model/Observer.php(224): mageCoreErrorHandler(2, 'Invalid argumen...', '/home/shop/...', 224, Array)
#1 /home/shop/01/www/vendor/firegento/germansetup/src/app/code/community/FireGento/GermanSetup/Model/Observer.php(161): FireGento_GermanSetup_Model_Observer->_buildKeywords(NULL)
#2 /home/shop/01/www/vendor/firegento/germansetup/src/app/code/community/FireGento/GermanSetup/Model/Observer.php(124): FireGento_GermanSetup_Model_Observer->_getCategoryKeywords(Object(Mage_Catalog_Model_Product))
#3 /home/shop/01/www/app/code/core/Mage/Core/Model/App.php(1338): FireGento_GermanSetup_Model_Observer->autogenerateMetaInformation(Object(Varien_Event_Observer))
#4 /home/shop/01/www/app/code/core/Mage/Core/Model/App.php(1311): Mage_Core_Model_App->_callObserverMethod(Object(FireGento_GermanSetup_Model_Observer), 'autogenerateMet...', Object(Varien_Event_Observer))
#5 /home/shop/01/www/app/Mage.php(447): Mage_Core_Model_App->dispatchEvent('catalog_product...', Array)
#6 /home/shop/01/www/app/code/core/Mage/Core/Model/Abstract.php(391): Mage::dispatchEvent('catalog_product...', Array)
#7 /home/shop/01/www/app/code/core/Mage/Catalog/Model/Abstract.php(315): Mage_Core_Model_Abstract->_beforeSave()
#8 /home/shop/01/www/app/code/core/Mage/Catalog/Model/Product.php(514): Mage_Catalog_Model_Abstract->_beforeSave()
#9 /home/shop/01/www/app/code/core/Mage/Core/Model/Abstract.php(316): Mage_Catalog_Model_Product->_beforeSave()
#10 /home/shop/01/www/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php(714): Mage_Core_Model_Abstract->save()
#11 /home/shop/01/www/app/code/core/Mage/Core/Controller/Varien/Action.php(419): Mage_Adminhtml_Catalog_ProductController->saveAction()
#12 /home/shop/01/www/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(250): Mage_Core_Controller_Varien_Action->dispatch('save')
#13 /home/shop/01/www/app/code/core/Mage/Core/Controller/Varien/Front.php(176): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#14 /home/shop/01/www/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#15 /home/shop/01/www/app/Mage.php(683): Mage_Core_Model_App->run(Array)
#16 /home/shop/01/www/index.php(88): Mage::run('', 'store')