From a81933131c62173108af44f5ad3fe433c3a07fa8 Mon Sep 17 00:00:00 2001
From: Brenton Bostick <bostick@gmail.com>
Date: Tue, 29 Oct 2024 08:00:00 -0400
Subject: [PATCH] fix using invalidated iterator

---
 lib/tablature.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/tablature.cpp b/lib/tablature.cpp
index c026f32..f1f9d73 100644
--- a/lib/tablature.cpp
+++ b/lib/tablature.cpp
@@ -1008,10 +1008,15 @@ TtbtFileTablature(const tbt_file_t &t) {
                 barLineWidth = 1;
             }
 
+            //
+            // save this because barLinesMap may be modified later and invalidate barLinesMapIt
+            //
+            bool barLinesMapItIsEnd = (barLinesMapIt == barLinesMap.end());
+
             //
             // bar line (when processed BEFORE the space)
             //
-            if (barLinesMapIt != barLinesMap.end()) {
+            if (!barLinesMapItIsEnd) {
 
                 if constexpr (0x70 <= VERSION) {
 
@@ -1356,7 +1361,7 @@ TtbtFileTablature(const tbt_file_t &t) {
             //
             // bar line (when processed AFTER the space)
             //
-            if (barLinesMapIt != barLinesMap.end()) {
+            if (!barLinesMapItIsEnd) {
 
                 if constexpr (0x70 <= VERSION) {