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 ('d07794e2c09740e6214b4e6d2a051551', -1, 1714105000, 1714105000, '12be9c50', -4, 0, 0)

Line : 187
File : sessions.php