phpBB : Critical Error

Error creating new sessions

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f48dc628199ac51c6b07f5ea120011c1' 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 ('f48dc628199ac51c6b07f5ea120011c1', -1, 1511467722, 1511467722, '36e13959', 4, 0, 0)

Line : 187
File : sessions.php