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 ('72b213f237e2f470dd54e0459a37db66', -1, 1730418682, 1730418682, '0390157e', -4, 0, 0)

Line : 187
File : sessions.php