phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '8f919da1406f2cef520490e7dd7b3f8a' 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 ('8f919da1406f2cef520490e7dd7b3f8a', -1, 1769879863, 1769879863, 'd849d851', -4, 0, 0)

Line : 187
File : sessions.php