phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '9767bc8df9348c08330a37392e248f71' 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 ('9767bc8df9348c08330a37392e248f71', -1, 1770011537, 1770011537, 'd849d817', -4, 0, 0)

Line : 187
File : sessions.php