phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '2599c3bcbe149081fa14a5d2ac16bf6d' 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 ('2599c3bcbe149081fa14a5d2ac16bf6d', -1, 1475224007, 1475224007, '3692d369', 57, 0, 0)

Line : 205
File : sessions.php