Fixed off by one range issue

meta/GMuonMinus2.m

@@ -618,7 +618,7 @@ If you add new kinds of vertices (e.g for new diagram types):
            indexBounds = (With[{particleIndex = #},
                                (If[#[[1]] === SARAH`generation,
                                    {particleInfo[[particleIndex, 2]]-1, particleInfo[[particleIndex, 3]]},
-                                   {1, #[[2]]}]
+                                   {0, #[[2]]}]
                                 &) /@ particleInfo[[particleIndex, 5]]]
                           &) /@ Table[i, {i, Length[particles]}];
            indexBounds = Cases[Flatten[indexBounds, 1], Except[{}]];