phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '87837f17ee8b69746239b494c55db2f4' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('87837f17ee8b69746239b494c55db2f4', -1, 1769928077, 1769928077, 'd849d822', -4, 0, 0)

Line : 187
File : sessions.php