phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '518bf0d0e5f7d9bc4ce0987a49fb717f' 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 ('518bf0d0e5f7d9bc4ce0987a49fb717f', -1, 1768352870, 1768352870, '12610e58', -10, 0, 0)

Line : 187
File : sessions.php