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 ('1adb33a4e1bf88e88b7c66dba1450774', -1, 1711676438, 1711676438, '03514f87', -4, 0, 0)

Line : 187
File : sessions.php