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 ('73b7e8e0a53d20a908b93237809223af', -1, 1711687541, 1711687541, '03eefe4e', -11, 0, 0)

Line : 187
File : sessions.php