phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6e294f7819b9785789865da12e6b979d' 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 ('6e294f7819b9785789865da12e6b979d', -1, 1495708722, 1495708722, '36a6c5e6', 23, 0, 0)

Line : 187
File : sessions.php