phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'bf473a38f8b6faa3a026752effb7926e' 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 ('bf473a38f8b6faa3a026752effb7926e', -1, 1768277435, 1768277435, 'd849d81c', -4, 0, 0)

Line : 187
File : sessions.php