phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '703e9554c3b048e0e727d20faf0b714f' 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 ('703e9554c3b048e0e727d20faf0b714f', -1, 1495605872, 1495605872, '17149306', 4, 0, 0)

Line : 187
File : sessions.php