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 ('91374c84c3a6960e89d3fc8ff4845e0f', -1, 1714018709, 1714018709, '12e19520', 0, 0, 0)

Line : 187
File : sessions.php