phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'ad697b14259205e4582853f87303bea0' 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 ('ad697b14259205e4582853f87303bea0', -1, 1495558134, 1495558134, '36a2137b', 24, 0, 0)

Line : 187
File : sessions.php