From b6614c61a6680bb7de319c7aab506b704fc30aeb Mon Sep 17 00:00:00 2001
From: Bimal Gaudel <bimalgaudel@gmail.com>
Date: Thu, 21 Nov 2024 08:42:31 -0500
Subject: [PATCH] Bug fix: do not try to multiply empty tensor(s).

---
 src/TiledArray/einsum/tiledarray.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/TiledArray/einsum/tiledarray.h b/src/TiledArray/einsum/tiledarray.h
index e341e646a9..ace7caa15a 100644
--- a/src/TiledArray/einsum/tiledarray.h
+++ b/src/TiledArray/einsum/tiledarray.h
@@ -664,6 +664,7 @@ auto einsum(expressions::TsrExpr<ArrayA_> A, expressions::TsrExpr<ArrayB_> B,
               using TensorT = std::remove_reference_t<decltype(el)>;
 
               auto mult_op = [&inner](auto const &l, auto const &r) -> TensorT {
+                if (l.empty() || r.empty()) return TensorT{};
                 return inner.h ? TA::detail::tensor_hadamard(l, inner.A, r,
                                                              inner.B, inner.C)
                                : TA::detail::tensor_contract(l, inner.A, r,