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 ('b7b5815835e2558fb3c57d72b83b0f22', -1, 1711627013, 1711627013, '03514f87', -4, 0, 0)

Line : 187
File : sessions.php