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 ('a096ab3369f796ff88817fd7c00b6fd5', -1, 1714043988, 1714043988, '127678cc', -7, 0, 0)

Line : 187
File : sessions.php