phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4c2217efae09c13b47f724047e545902' 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 ('4c2217efae09c13b47f724047e545902', -1, 1508522086, 1508522086, '3651b299', -4, 0, 0)

Line : 174
File : sessions.php