phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a4c07ff24a39b9a69fa596d16b3c9cf7' 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 ('a4c07ff24a39b9a69fa596d16b3c9cf7', -1, 1776424079, 1776424079, 'ba02a010', -2, 0, 0)

Line : 187
File : sessions.php