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 ('df5b7645a4cc0386accbeac0ccf391a1', -1, 1714003031, 1714003031, '12743fec', -4, 0, 0)

Line : 187
File : sessions.php