phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b1479ac6c2ba4b3a0520d96d0b5e7bf5' 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 ('b1479ac6c2ba4b3a0520d96d0b5e7bf5', -1, 1781762951, 1781762951, 'd849d958', 1, 0, 0)

Line : 187
File : sessions.php