phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '402d3e2f2fe8b5fd6208079640aa86f8' 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 ('402d3e2f2fe8b5fd6208079640aa86f8', -1, 1768631715, 1768631715, 'd849d834', -4, 0, 0)

Line : 187
File : sessions.php