Unexpected error computing PreImagesRepresentative

[fingolfin]

Another issue based on http://tracker.gap-system.org/issues/391: The following error is unexpected, I'd instead expect PreImagesRepresentative to print an error that the object is not contained in the image of the map?

gap> g := DihedralGroup(100);;
gap> g := SemidirectProduct(AutomorphismGroup(g),g);;
gap> f := GroupHomomorphismByImages(g,g,List(GeneratorsOfGroup(g),x->(x^Projection(g))^Embedding(g,1)));
[ f1, f2, f3, f4, f5, f6, f7, f8, f9, f10 ] -> [ f1, f2, f3, f4, f5, f6, <identity> of ..., <identity> of ..., <identity> of ..., <identity> of ... ]
gap> g.7 in Range(f);
true
gap> g.7 in Image(f);
false
gap> PreImagesRepresentative(f,g.7);
Error, List Element: <list>[7] must have an assigned value in
  if map[d] > max  then
    elm := id;
else
    if not IsBound( map[d] )  then
        Error( "<elm> lies not in group defined by <pcgs>" );
    fi;
    ll := LeadingExponentOfPcElement( pa, elm );
    lr := lc[d];
    exp[map[d]] := ll / lr mod ros[d];
    elm := LeftQuotientPowerPcgsElement( pcgs, map[d], exp[map[d]], elm );
fi; at gap.github/lib/pcgsind.gi:1411 called from
ExponentsOfPcElement( ParentPcgs( pcgs ), elm, pcgs!.depthsInParent ) at gap.github/lib/pcgsind.gi:1472 called from
ExponentsOfPcElement( pcgsR, elm ) at gap.github/lib/ghompcgs.gi:504 called from

[hulpke]

The if in the else branch should be first, I'll fix this. Wirth it the error message will be
lies not in group defined by
which I think is a plausible error indicating the problem.

[fingolfin]

This has been resolved by @hulpke and now gives this helpful error:

gap> PreImagesRepresentative(f,g.7);
Error, <elm> lies not in group defined by <pcgs> at /Users/mhorn/Projekte/GAP/gap.github/lib/pcgsind.gi:1397 called from
ExponentsOfPcElement( ParentPcgs( pcgs ), elm, pcgs!.depthsInParent ) at /Users/mhorn/Projekte/GAP/gap.github/lib/pcgsind.gi:1471 called from
ExponentsOfPcElement( pcgsR, elm ) at /Users/mhorn/Projekte/GAP/gap.github/lib/ghompcgs.gi:504 called from
<function "unknown">( <arguments> )
 called from read-eval loop at *stdin*:14
you can 'quit;' to quit to outer loop, or
you can 'return;' to continue
brk>