phpBB : Critical Error

Error creating new session : session_begin

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a15f8fa7a1abeac74e878f2c251d9778' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('a15f8fa7a1abeac74e878f2c251d9778', -1, 1715865482, 1715865482, '00000000', -4, 0)

Line : 158
File : /www/htdocs/w0063aaa/Dermion/phpBB2/includes/sessions.php