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 ('a560d8610f3b1b309a0af86ee88079b0', -1, 1714712057, 1714712057, '0310937c', -4, 0, 0)

Line : 187
File : sessions.php