phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '9aaa86a677d718a3e7d1c8ba0f0bf21f' 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 ('9aaa86a677d718a3e7d1c8ba0f0bf21f', -1, 1767140371, 1767140371, 'd849d819', 8, 0, 0)

Line : 187
File : sessions.php