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 ('b71688c0cbfdc101a30857c4b3a3d9ce', -1, 1711644471, 1711644471, '22ccc4ce', -2, 0, 0)

Line : 187
File : sessions.php