Merge pull request #3246 from stan-dev/stansummary-segfault

PSR: Return early if no draws
stan-dev · Jan 3, 2024 · 267722a · 267722a
2 parents 1c85085 + aad5d48
commit 267722a
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/stan/analyze/mcmc/compute_potential_scale_reduction.hpp b/src/stan/analyze/mcmc/compute_potential_scale_reduction.hpp
@@ -35,6 +35,9 @@ inline double compute_potential_scale_reduction(
     std::vector<const double*> draws, std::vector<size_t> sizes) {
   int num_chains = sizes.size();
   size_t num_draws = sizes[0];
+  if (num_draws == 0) {
+    return std::numeric_limits<double>::quiet_NaN();
+  }
   for (int chain = 1; chain < num_chains; ++chain) {
     num_draws = std::min(num_draws, sizes[chain]);
   }