From 1ead14589e1ba07ca6bf82743c936091840165f1 Mon Sep 17 00:00:00 2001
From: ToruNiina <niina.toru.68u@gmail.com>
Date: Wed, 4 Nov 2020 23:24:02 +0900
Subject: [PATCH] fix: check if it is empty before calling back()

---
 toml/region.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/toml/region.hpp b/toml/region.hpp
index 6761aed..37ba3a3 100644
--- a/toml/region.hpp
+++ b/toml/region.hpp
@@ -344,7 +344,7 @@ struct region final : public region_base
                     {
                         // unwrap the first '#' by std::next.
                         auto str = make_string(std::next(comment_found), iter);
-                        if(str.back() == '\r') {str.pop_back();}
+                        if(!str.empty() && str.back() == '\r') {str.pop_back();}
                         com.push_back(std::move(str));
                     }
                     else
@@ -397,7 +397,7 @@ struct region final : public region_base
                 {
                     // unwrap the first '#' by std::next.
                     auto str = make_string(std::next(comment_found), this->line_end());
-                    if(str.back() == '\r') {str.pop_back();}
+                    if(!str.empty() && str.back() == '\r') {str.pop_back();}
                     com.push_back(std::move(str));
                 }
             }