Query solving time in JuMP v0.19

MethodError: no method matching get(::Int64, ::MathOptInterface.SolveTime)

This suggests that you are passing m[k] is an Int64.

As one potential problem, it looks like you initialize k=10 models, but look through k=100 models in the second loop.

It is hard to say anything else without a minimal working example (MWE). See: