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 ('2ec8715f418ba23caa149943780786e9', -1, 1714102020, 1714102020, '12db3f5a', 6, 0, 0)

Line : 187
File : sessions.php