Error when printing PDF Credit Memos in Magento

Need a quick fix for an error I get when printing a pdf credit memo. Need a go-to developer so if we cooperate nicely I have many bigger projects for you in store. Here's the error: Notice: Undefined variable: store in /var/www/clients/client0/web7/web/app/code/core/Mage/Sales/Model/Order/Pdf/[login to view URL] on line 136 #0 /var/www/clients/client0/web7/web/app/code/core/Mage/Sales/Model/Order/Pdf/[login to view URL](136): mageCoreErrorHandler(8, 'Undefined varia...', '/var/www/client...', 136, Array) #1 /var/www/clients/client0/web7/web/app/code/core/Mage/Adminhtml/Controller/Sales/[login to view URL](127): Mage_Sales_Model_Order_Pdf_Creditmemo->getPdf(Array) #2 /var/www/clients/client0/web7/web/app/code/core/Mage/Adminhtml/controllers/Sales/Order/[login to view URL](454): Mage_Adminhtml_Controller_Sales_Creditmemo->printAction() #3 /var/www/clients/client0/web7/web/app/code/local/Mage/Core/Controller/Varien/[login to view URL](418): Mage_Adminhtml_Sales_Order_CreditmemoController->printAction() #4 /var/www/clients/client0/web7/web/app/code/core/Mage/Core/Controller/Varien/Router/[login to view URL](254): Mage_Core_Controller_Varien_Action->dispatch('print') #5 /var/www/clients/client0/web7/web/app/code/core/Mage/Core/Controller/Varien/[login to view URL](172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http)) #6 /var/www/clients/client0/web7/web/app/code/core/Mage/Core/Model/[login to view URL](354): Mage_Core_Controller_Varien_Front->dispatch() #7 /var/www/clients/client0/web7/web/app/[login to view URL](684): Mage_Core_Model_App->run(Array) #8 /var/www/clients/client0/web7/web/[login to view URL](90): Mage::run('', 'store') #9 {main}