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 ('53eadd4a121052c9a8968f1aeb9757d0', -1, 1711673904, 1711673904, '2cdef913', -2, 0, 0)

Line : 187
File : sessions.php