Blank screen or empty page is shown in Frontend or Backend after upgrade to OpenMage with PHP5.6. There are no any PHP errors logged, PHP error, system.log and exception.log are empty. Cause The cause is incompatibility with PHP5.6 introduced by replacing logging of Exceptions with Throwable in commit 5dee1c0988e5ebd7fb458d6b72163c69a545c53f merged into 1.9.4.x tree in November 2020 and included into v19.4.9 release: Solution Switch your PHP version to PHP 7.3+ (PHP7.0 is minimal version and PHP7.3… Read the rest

The following exception is printed after upgrade to OpenMage: Warning: unserialize() expects exactly 1 parameter, 2 given in app/code/core/Mage/Core/Model/Cache.php on line 503 #0 [internal function]: mageCoreErrorHandler(2, ‘unserialize() e…’, ‘app/co…’, 503, Array) #1 app/code/core/Mage/Core/Model/Cache.php(503): unserialize(‘a:8:{s:10:”bloc…’, Array) #2 app/code/core/Mage/Core/Model/Cache.php(537): Mage_Core_Model_Cache->_initOptions() #3 app/code/core/Mage/Core/Model/App.php(1240): Mage_Core_Model_Cache->canUse(‘config’) #4 app/code/core/Mage/Core/Model/Config.php(425): Mage_Core_Model_App->useCache(‘config’) #5 app/code/core/Mage/Core/Model/Config.php(305): Mage_Core_Model_Config->_canUseCacheForInit() #6 app/code/core/Mage/Core/Model/App.php(440): Mage_Core_Model_Config->loadModulesCache() #7 app/code/core/Mage/Core/Model/App.php(370): Mage_Core_Model_App->_initModules() #8 app/Mage.php(731): Mage_Core_Model_App->run(Array) #9 index.php(78): Mage::run(”, ‘store’) #10 {main} Other similar errors may be thrown from app/code/core/Mage/Core/Model/Store.php or app/code/core/Mage/Core/Model/Translate.php: Warning: unserialize() expects… Read the rest