phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b670d13885a704fb6f04a0febd9a5bab' 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 ('b670d13885a704fb6f04a0febd9a5bab', -1, 1495542530, 1495542530, '36a2a8bb', -1, 0, 0)

Line : 187
File : sessions.php