phpBB : Critical Error

Error creating new sessions

DEBUG MODE

SQL Error : 1062 Duplicate entry '4a424ee483d660f0f914ffebd6600bbd' 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 ('4a424ee483d660f0f914ffebd6600bbd', -1, 1508279302, 1508279302, '365183bd', 4, 0, 0)

Line : 187
File : sessions.php