phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4c02159e0f7b37988949163295d9f34f' 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 ('4c02159e0f7b37988949163295d9f34f', -1, 1511495691, 1511495691, '36509d85', 1, 0, 0)

Line : 187
File : sessions.php