Matrix substitution ambiguous

[matbesancon]

H is a matrix of Num, x is a vector of Num

julia> Symbolics.substitute(H, x .=> 0.5)
ERROR: MethodError: substitute(::Matrix{Num}, ::Vector{Pair{Num, Float64}}) is ambiguous.

Candidates:
  substitute(nums::Array{Num}, rules; kw...)
    @ Symbolics ~/.julia/packages/Symbolics/PxO3a/src/equations.jl:145
  substitute(expr, s::Vector; kw...)
    @ Symbolics ~/.julia/packages/Symbolics/PxO3a/src/num.jl:79

Possible fix, define
  substitute(::Array{Num}, ::Vector)