Getting KeyError in pkg-dependency-graph

[probonopd]

Hello @adriaandegroot, thanks for this very useful tool. However I am getting no graph but this error, do you have an idea what might be causing this and how to resolve it?

FreeBSD: /home/user% python3.7 pkg-dependency-graph.py 
Traceback (most recent call last):
  File "pkg-dependency-graph.py", line 129, in <module>
    dependency_graph = normalize_deps(collect_pkg())
  File "pkg-dependency-graph.py", line 65, in normalize_deps
    second_deps.update(set(deps[k]))
KeyError: 'lang/perl5.32'