phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6ff31e6f5899b479a9644c38913474a7' 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 ('6ff31e6f5899b479a9644c38913474a7', -1, 1758479872, 1758479872, 'd849d815', -4, 0, 0)

Line : 187
File : sessions.php