phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b57009520f13bf493d9297b3c8253a01' 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 ('b57009520f13bf493d9297b3c8253a01', -1, 1419129668, 1419129668, '36e3d78b', -1, 0, 0)

Line : 187
File : sessions.php