can only concatenate str on --why

[kallisti5]

./haikuporter --get-dependencies  -w libgl nheko
Warning: dev-libs/coeurl-0.3.0   is overruled by duplicate in dev-cpp - please remove one of them
Checking if any dependency-infos need to be updated ...
Looking for stale dependency-infos ...
can only concatenate str (not "NoneType") to str