phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '1aef9491574bf8b553e796bfacf0faa6' 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 ('1aef9491574bf8b553e796bfacf0faa6', -1, 1768323800, 1768323800, 'c0a8100c', -501, 0, 0)

Line : 187
File : sessions.php