Can't call method "isWalkable" on an undefined value

[shirley062680]

Hi please examine the following:

OpenKore version what-will-become-2.1
Network handler = Network::DirectConnection
SVN revision: unknown
No loaded plugins.

Error message:
Can't call method "isWalkable" on an undefined value at src/Misc.pm line 706.

Stack trace:
Can't call method "isWalkable" on an undefined value at src/Misc.pm line 706.
at src/Misc.pm line 706
Misc::closestWalkableSpot(undef, 'HASH(0x28162c4)') called at src/Misc.pm line 3480
Misc::compilePortals() called at src/functions.pl line 373
main::initPortalsDatabase() called at src/functions.pl line 89
main::mainLoop() called at src/Interface.pm line 75
Interface::mainLoop('Interface::Console::Win32=HASH(0x1228254)') called at openkore.pl line 97
main::__start() called at start.pl line 136

Died at this line:
foreach my $z (@spots) {
* next if !$field->isWalkable($pos->{x} + $z->[0], $pos->{y} + $z->[1]);
$pos->{x} += $z->[0];

am playing at the new loki server before its july 25 patch my openkore is fine and working my svn revision that i used is svn revision 8084
am using an auto update and i've got revision 8087. any help please will be much appreciated