phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a15deccd418c340cf69f8d3dbf8e78b4' 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 ('a15deccd418c340cf69f8d3dbf8e78b4', -1, 1739064096, 1739064096, '030e05b4', 1, 0, 0)

Line : 187
File : sessions.php