phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '20ccd32301c2f40177ff08339ef2b1d6' 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 ('20ccd32301c2f40177ff08339ef2b1d6', -1, 1770686675, 1770686675, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php