phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b8915358edc0dd39c1a7503056776f68' 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 ('b8915358edc0dd39c1a7503056776f68', -1, 1757604968, 1757604968, 'd849d822', -4, 0, 0)

Line : 187
File : sessions.php