From a5100a9d3553f675c480ba4e174c2e6299f036b2 Mon Sep 17 00:00:00 2001
From: joaquintides <joaquin@tid.es>
Date: Fri, 10 Mar 2023 19:55:51 +0100
Subject: [PATCH] fixed incomplete porting of PR187

---
 include/boost/unordered/detail/foa/table.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/boost/unordered/detail/foa/table.hpp b/include/boost/unordered/detail/foa/table.hpp
index bff1a021..2c14631a 100644
--- a/include/boost/unordered/detail/foa/table.hpp
+++ b/include/boost/unordered/detail/foa/table.hpp
@@ -261,7 +261,8 @@ public:
   iterator begin()noexcept
   {
     iterator it{this->arrays.groups,0,this->arrays.elements};
-    if(!(this->arrays.groups[0].match_occupied()&0x1))++it;
+    if(this->arrays.elements&&
+       !(this->arrays.groups[0].match_occupied()&0x1))++it;
     return it;
   }