Mage registry key "m_fpc_don_t_check_if_cache_exist" already exists

#0 /storage/magento/releases/release_2019-07-22.15_00_31/app/Mage.php(223): Mage::throwException('Mage registry k...')
#1 /storage/magento/releases/release_2019-07-22.15_00_31/app/code/local/Mirasvit/Fpc/Model/Processor.php(365): Mage::register('m_fpc_don_t_che...', true)
#2 /storage/magento/releases/release_2019-07-22.15_00_31/app/code/local/Mirasvit/Fpc/Model/Processor.php(264): Mirasvit_Fpc_Model_Processor->_unregister()
#3 /storage/magento/releases/release_2019-07-22.15_00_31/app/code/core/Mage/Core/Model/App.php(1358): Mirasvit_Fpc_Model_Processor->serveResponse(Object(Varien_Event_Observer))
#4 /storage/magento/releases/release_2019-07-22.15_00_31/app/code/core/Mage/Core/Model/App.php(1337): Mage_Core_Model_App->_callObserverMethod(Object(Mirasvit_Fpc_Model_Processor), 'serveResponse', Object(Varien_Event_Observer))
#5 /storage/magento/releases/release_2019-07-22.15_00_31/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('controller_acti...', Array)
#6 /storage/magento/releases/release_2019-07-22.15_00_31/app/code/core/Mage/Core/Controller/Varien/Action.php(527): Mage::dispatchEvent('controller_acti...', Array)
#7 /storage/magento/releases/release_2019-07-22.15_00_31/app/code/core/Mage/Core/Controller/Front/Action.php(69): Mage_Core_Controller_Varien_Action->preDispatch()
#8 /storage/magento/releases/release_2019-07-22.15_00_31/app/code/core/Mage/Core/Controller/Varien/Action.php(407): Mage_Core_Controller_Front_Action->preDispatch()
#9 /storage/magento/releases/release_2019-07-22.15_00_31/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('noRoute')
#10 /storage/magento/releases/release_2019-07-22.15_00_31/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#11 /storage/magento/releases/release_2019-07-22.15_00_31/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#12 /storage/magento/releases/release_2019-07-22.15_00_31/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#13 /storage/magento/releases/release_2019-07-22.15_00_31/index.php(88): Mage::run('', 'store')
#14 {main}