phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'd50ca199af9e12b4388989b544df61cc' 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 ('d50ca199af9e12b4388989b544df61cc', -1, 1770388851, 1770388851, 'd849d88e', 32, 0, 0)

Line : 187
File : sessions.php