[Inkscape-devel] warning in LPE

Does anyone have insight on this:

live_effects/lpe-envelope.cpp: In member function 'virtual Geom::Piecewise<Geom::D2Geom::SBasis > Inkscape::LivePathEffect::LPEEnvelope::doEffect_pwd2(const Geom::Piecewise<Geom::D2Geom::SBasis >&)':

live_effects/lpe-envelope.cpp:218: warning: control reaches end of non-void function

I've been thinking I can address the structural and return issues, but I'd need to know what *should* be returned in the fallback case. Any ideas?