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 ('803f36272d7ae819fc308e3e1d9384a2', -1, 1711688090, 1711688090, '12e87dbc', -4, 0, 0)

Line : 187
File : sessions.php