phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '12a40da43cc7e57d4f73d07abcd360a2' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('12a40da43cc7e57d4f73d07abcd360a2', -1, 1781772043, 1781772043, 'd849d958', -9, 0, 0)

Line : 187
File : sessions.php