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 ('da62e25c0a7f93228399ed1db0d9dfc9', -1, 1711692575, 1711692575, '36d255cd', 7, 0, 0)

Line : 187
File : sessions.php