phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4ac601fe8ad463b1d34d37a4b45410eb' 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 ('4ac601fe8ad463b1d34d37a4b45410eb', -1, 1770106039, 1770106039, 'd849d8a2', -4, 0, 0)

Line : 187
File : sessions.php