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 ('86b3dff4235d4a9116f00e3f8d9f604e', -1, 1711630172, 1711630172, '12e8bc7a', -9, 0, 0)

Line : 187
File : sessions.php