Fatal error: Out of memory (allocated 4194304) (tried to allocate 20480 bytes) in /var/www/live/vendor/magento/framework/Serialize/Serializer/Json.php on line 37

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 1114 The table 'mgu3_session' is full in /var/www/live/vendor/magento/framework/DB/Statement/Pdo/Mysql.php:91 Stack trace: #0 /var/www/live/vendor/magento/framework/DB/Statement/Pdo/Mysql.php(91): PDOStatement->execute(Array) #1 /var/www/live/vendor/magento/framework/DB/Statement/Pdo/Mysql.php(107): Magento\Framework\DB\Statement\Pdo\Mysql->Magento\Framework\DB\Statement\Pdo\{closure}() #2 /var/www/live/vendor/magento/framework/DB/Statement/Pdo/Mysql.php(92): Magento\Framework\DB\Statement\Pdo\Mysql->tryExecute(Object(Closure)) #3 /var/www/live/vendor/magento/zendframework1/library/Zend/Db/Statement.php(303): Magento\Framework\DB\Statement\Pdo\Mysql->_execute(Array) #4 /var/www/live/vendor/magento/zendframework1/library/Zend/Db/Adapter/Abstract.php(480): Zend_Db_Statement->execute(Array) #5 /var/www/live/vendor/magento/zendframework1/library/Zend/Db/Adapter/Pdo/Abstract.php(238): Zend_Db_Adapter_Abstract->query('INSERT INTO `mg...', Array) #6 /var/www/liv in /var/www/live/vendor/magento/framework/DB/Statement/Pdo/Mysql.php on line 110