phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '7df9fc18ff0a1badc7afe5d12e25abc1' 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 ('7df9fc18ff0a1badc7afe5d12e25abc1', -1, 1771814028, 1771814028, '2d971ed8', -9, 0, 0)

Line : 187
File : sessions.php