phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4bb2e4dd272ea6abd8b1f17c87e43c7f' 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 ('4bb2e4dd272ea6abd8b1f17c87e43c7f', -1, 1770000044, 1770000044, 'd849d817', -4, 0, 0)

Line : 187
File : sessions.php