phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6aaf6404eb31e13b0471ec50df4d8376' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6aaf6404eb31e13b0471ec50df4d8376', -1, 1770099107, 1770099107, '00000000', 19, 0, 0)

Line : 187
File : sessions.php