Exception in getting method pointer std::min

I'm getting this message when running a plotter:

Exception in getting method pointer std::min: requested class 'min' does not exist

The code looks like:

jetPairs = op.combine(jets, N=2)
minJetDR = op.rng_min(jetPairs, lambda pair: op.deltaR(pair[0].p4, pair[1].p4))
plots.append(Plot.make1D("minJetDR", minJetDR, selection, EqBin(40, 0.4, 2.))

What's strange is that there is no crash and that the resulting plots look perfectly fine... I used the rng_min function before and I never saw this, perhaps it's something that was introduced in !74 (merged)?

I'm attaching the full log: log