phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '663986d85f21274b6811f215d4c28b92' 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 ('663986d85f21274b6811f215d4c28b92', -1, 1770372336, 1770372336, 'd849d868', -2, 0, 0)

Line : 187
File : sessions.php