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 ('f2288091bafbbed0b0371e3f3621f812', -1, 1714616950, 1714616950, '12deb3ba', -50, 0, 0)

Line : 187
File : sessions.php