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 ('0dff7c8a57eb6743b0cf5d62b61ecff9', -1, 1711659612, 1711659612, '2cde6831', -10, 0, 0)

Line : 187
File : sessions.php