phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4f6cad78942616ffd5f894b0b75c4747' 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 ('4f6cad78942616ffd5f894b0b75c4747', -1, 1762508755, 1762508755, 'c31412cc', 12, 0, 0)

Line : 187
File : sessions.php