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 ('a6dcc25ce7075468f5418d6660095826', -1, 1711698102, 1711698102, '12ce4c2d', -4, 0, 0)

Line : 187
File : sessions.php