phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '1c68781f9a6f07e0ef3b50e5c5f75584' 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 ('1c68781f9a6f07e0ef3b50e5c5f75584', -1, 1495667945, 1495667945, '36a2137b', 22, 0, 0)

Line : 187
File : sessions.php