phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '3d980ba8876a9d60bd908f7947f2fd4e' 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 ('3d980ba8876a9d60bd908f7947f2fd4e', -1, 1770897967, 1770897967, 'd849d821', -9, 0, 0)

Line : 187
File : sessions.php