phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b4a203d089d0e55b1f3e17e23e898e6d' 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 ('b4a203d089d0e55b1f3e17e23e898e6d', -1, 1770210099, 1770210099, 'd849d8a2', -4, 0, 0)

Line : 187
File : sessions.php