Warning: imagewebp(): Palette image not supported by webp  in /var/www/retrobad-shop.de/app/code/community/Yireo/Webp/Helper/Data.php on line 253

#0 [internal function]: mageCoreErrorHandler(2, 'imagewebp(): Pa...', '/var/www/retrob...', 253, Array)
#1 /var/www/retrobad-shop.de/app/code/community/Yireo/Webp/Helper/Data.php(253): imagewebp(Resource id #90, '/var/www/retrob...')
#2 /var/www/retrobad-shop.de/app/code/community/Yireo/Webp/Helper/Data.php(220): Yireo_Webp_Helper_Data->convertToWebpViaGd('/var/www/retrob...', '/var/www/retrob...')
#3 /var/www/retrobad-shop.de/app/code/community/Yireo/Webp/Model/Observer.php(132): Yireo_Webp_Helper_Data->convertToWebp('/var/www/retrob...')
#4 /var/www/retrobad-shop.de/app/code/community/Yireo/Webp/Model/Observer.php(82): Yireo_Webp_Model_Observer->convertImageUrlToWebp('https://traditi...')
#5 /var/www/retrobad-shop.de/app/code/core/Mage/Core/Model/App.php(1358): Yireo_Webp_Model_Observer->coreBlockAbstractToHtmlAfter(Object(Varien_Event_Observer))
#6 /var/www/retrobad-shop.de/app/code/core/Mage/Core/Model/App.php(1337): Mage_Core_Model_App->_callObserverMethod(Object(Yireo_Webp_Model_Observer), 'coreBlockAbstra...', Object(Varien_Event_Observer))
#7 /var/www/retrobad-shop.de/app/Mage.php(451): Mage_Core_Model_App->dispatchEvent('core_block_abst...', Array)
#8 /var/www/retrobad-shop.de/app/code/core/Mage/Core/Block/Abstract.php(947): Mage::dispatchEvent('core_block_abst...', Array)
#9 /var/www/retrobad-shop.de/app/code/core/Mage/Core/Model/Layout.php(555): Mage_Core_Block_Abstract->toHtml()
#10 /var/www/retrobad-shop.de/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput()
#11 /var/www/retrobad-shop.de/app/code/core/Mage/Cms/controllers/IndexController.php(91): Mage_Core_Controller_Varien_Action->renderLayout()
#12 /var/www/retrobad-shop.de/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Cms_IndexController->defaultNoRouteAction()
#13 /var/www/retrobad-shop.de/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('defaultNoRoute')
#14 /var/www/retrobad-shop.de/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#15 /var/www/retrobad-shop.de/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#16 /var/www/retrobad-shop.de/app/Mage.php(686): Mage_Core_Model_App->run(Array)
#17 /var/www/retrobad-shop.de/index.php(85): Mage::run('traditionell', 'website')
#18 {main}