phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6121736cad5a024bf9a5f2b94e735976' 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 ('6121736cad5a024bf9a5f2b94e735976', -1, 1770214825, 1770214825, 'd849d8a2', -4, 0, 0)

Line : 187
File : sessions.php