phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '78ff2d7112e3c5e3c2c9135df4704b58' 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 ('78ff2d7112e3c5e3c2c9135df4704b58', -1, 1770985527, 1770985527, 'd849d809', -4, 0, 0)

Line : 187
File : sessions.php