phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '2f03fef2fcb160664f7b88d1149c04e3' for key 1

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('2f03fef2fcb160664f7b88d1149c04e3', -1, 1498349184, 1498349184, '36a2d3aa', 12, 0, 0)

Line : 187
File : sessions.php