Fatal error: Uncaught PDOException: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '' for key 'sessions.sessions_pkey' in /home/jk_karona/revista.spmi.pt/lib/pkp/lib/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:115 Stack trace: #0 /home/jk_karona/revista.spmi.pt/lib/pkp/lib/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php(115): PDOStatement->execute(NULL) #1 /home/jk_karona/revista.spmi.pt/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Database/Connection.php(489): Doctrine\DBAL\Driver\PDOStatement->execute() #2 /home/jk_karona/revista.spmi.pt/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Database/Connection.php(664): Illuminate\Database\Connection->Illuminate\Database\{closure}('INSERT INTO ses...', Array) #3 /home/jk_karona/revista.spmi.pt/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Database/Connection.php(631): Illuminate\Database\Connection->runQueryCallback('INSERT INTO ses...', Array, Object(Closure)) #4 /home/jk_karona/revista.spmi.pt/lib/pkp in /home/jk_karona/revista.spmi.pt/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Database/Connection.php on line 671