phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a0c4e3a99a3c191dad36c91e3acdc99e' 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 ('a0c4e3a99a3c191dad36c91e3acdc99e', -1, 1765102145, 1765102145, 'd849d8bc', -4, 0, 0)

Line : 187
File : sessions.php