phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a34b9fc968d3183411065e3a2854d785' 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 ('a34b9fc968d3183411065e3a2854d785', -1, 1769256415, 1769256415, 'd849d814', 5, 0, 0)

Line : 187
File : sessions.php