mrtg error line 274 and 286

[nekdo123]

apache error log:

[Fri Nov 30 17:22:37 2007] [error] [client #####] Use of uninitialized
value in concatenation (.) or string at /var/www/cgi-bin/mrtg/mrtg-
rrd.cgi line 274., referer: http://#####/cgi-bin/mrtg/mrtg-rrd.cgi/
[Fri Nov 30 17:22:37 2007] [error] [client #####] Use of uninitialized
value in concatenation (.) or string at /var/www/cgi-bin/mrtg/mrtg-
rrd.cgi line 274., referer: http://######/cgi-bin/mrtg/mrtg-rrd.cgi/
[Fri Nov 30 17:22:37 2007] [error] [client #####] Use of uninitialized
value in concatenation (.) or string at /var/www/cgi-bin/mrtg/mrtg-
rrd.cgi line 274., referer: http://######/cgi-bin/mrtg/mrtg-rrd.cgi/
[Fri Nov 30 17:22:37 2007] [error] [client #####] Use of uninitialized
value in concatenation (.) or string at /var/www/cgi-bin/mrtg/mrtg-
rrd.cgi line 286., referer: http://#####/cgi-bin/mrtg/mrtg-rrd.cgi/
[Fri Nov 30 17:22:37 2007] [error] [client #####] Use of uninitialized
value in concatenation (.) or string at /var/www/cgi-bin/mrtg/mrtg-
rrd.cgi line 286., referer: http://#####/cgi-bin/mrtg/mrtg-rrd.cgi/
[Fri Nov 30 17:22:37 2007] [error] [client #####] Use of uninitialized
value in concatenation (.) or string at /var/www/cgi-bin/mrtg/mrtg-
rrd.cgi line 286.,

(FEDORA 8, Apache/2.2.6 (Unix), mrtg version 2.9.17, mrtg-rrd.cgi
version 0.7 )