phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '77efc7ba2320a2ac5d84270e8f4cfc97' 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 ('77efc7ba2320a2ac5d84270e8f4cfc97', -1, 1769371131, 1769371131, 'd849d814', -4, 0, 0)

Line : 187
File : sessions.php