[perl #126018] [BUG] Cannot invoke this object (REPR: Null, cs = 0)

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$ cat golf.p6
class A
{
    has $.integer where * > 0;
    has %!hash;

    method meth {
        my $a = 0;
        my $b = $a / $!integer;
        my $c = $a ?? 100 * ($a  - +%!hash) / $a !! 0;
    }
}

A.new(integer => 7).meth;

$ perl6  golf.p6
===SORRY!===
Cannot invoke this object (REPR: Null, cs = 0)

$ perl6 --version
This is perl6 version 2015.07.1-756-g16d366a built on MoarVM version 
2015.07-108-g7e9f29e