phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '669cfc1ee2c530b935d1a4ce50f31852' for key 1

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('669cfc1ee2c530b935d1a4ce50f31852', -1, 1498571963, 1498571963, '36c6a37c', -11, 0, 0)

Line : 187
File : sessions.php