Hom mutate npc help! wont mutate

[DearDrew]

if (.@i) {

morphembryo;

hommutate 6047+.@i;

set Zeny,Zeny - 50000; }

else {

set $@humm,rand(5);

hommutate 6047+$@humm;};

close;

my npc can mutate hom  just fine using selection .@i

but it i choose random... it wont mutate

pls help!!