phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('51e6569e4370ba7dd2c7888e91dfa4ec', -1, 1713579913, 1713579913, '0390caa7', 5, 0, 0)

Line : 187
File : sessions.php