--- a/agent.pl	Mon Nov 03 03:17:43 2008 +0800
+++ b/agent.pl	Mon Nov 03 11:42:59 2008 +0800
@@ -56,14 +56,14 @@
 
 sub is_corruption {
     my ($self, $city) = @_;
-    return $city->{corruption};
+    return ($city->{corruption} > 0) ? 1 : 0;
 }
 
 sub is_any_corruption {
     my ($self, $city) = @_;
 
     foreach (keys(%{$self->{ikariam}->{cities}})) {
-        return 1 if($self->{ikariam}->{cities}->{$_}->{corruption} == 1);
+        return ($self->{ikariam}->{cities}->{$_}->{corruption} > 0) ? 1 : 0;
     }
     return 0;
 }
@@ -225,7 +225,8 @@
     # TODO, 依照升級比例算 CP 值最高
     if($self->is_greekfire_researched() eq 1 && $city->{buildings}->{shipyard} >= 5) {
         # ok, we can build Flamethrower.
-        if(($city->{'fleet'}->{BallistaShip} / $city->{'fleet'}->{Flamethrower}) <= (1.5/1)) {
+        if(defined($city->{'fleet'}->{Flamethrower}) && ($city->{'fleet'}->{Flamethrower} > 0)
+                && ($city->{'fleet'}->{BallistaShip} / $city->{'fleet'}->{Flamethrower}) <= (1.5/1)) {
             return 213; # 強弩船
         } else {
             return 211; # 噴火船