Fix the fix

Author: blegat

src/ncmult.jl

@@ -70,7 +70,7 @@ function multiplyvar(x::PolyVar{false}, v::Vector{PolyVar{false}}, z::Vector{Int
         end
         i -= 1
         while i > 0 && v[i] != x
-            if i > 1 && v[i] < v[i + 1]
+            if i < length(v) && v[i] < v[i + 1]
                 ndrop += 1
             end
             if ndrop >= droplim2 || (ndrop >= droplim1 && v[i] > x)