phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a1e771c99701ac7a5e4a657ffbed5e5a' 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 ('a1e771c99701ac7a5e4a657ffbed5e5a', -1, 1769049857, 1769049857, 'd849d89c', -9, 0, 0)

Line : 187
File : sessions.php