phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c96dee2b0441b4bc3da0ac9f408f5e3b' 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 ('c96dee2b0441b4bc3da0ac9f408f5e3b', -1, 1771016761, 1771016761, 'd849d897', -9, 0, 0)

Line : 187
File : sessions.php