phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '1a8206c41f479231edb550d8201e2dfe' 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 ('1a8206c41f479231edb550d8201e2dfe', -1, 1781073772, 1781073772, 'd849d8ae', 0, 0, 0)

Line : 187
File : sessions.php