From 5ba4e6d453242860197e1970869d778c12d1796c Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Tue, 9 Nov 2021 12:43:13 +0100
Subject: Merge pull request #2932 from rouault/fix_2931

PROJStringFormatter::toString(): avoid invalid iterator increment (fixes #2931)
---
 src/iso19111/io.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/iso19111/io.cpp b/src/iso19111/io.cpp
index 5f2472a7..f8a4672a 100644
--- a/src/iso19111/io.cpp
+++ b/src/iso19111/io.cpp
@@ -7678,7 +7678,7 @@ const std::string &PROJStringFormatter::toString() const {
                 iterCur = steps.erase(iterPrev, std::next(iterCur));
                 if (iterCur != steps.begin())
                     iterCur = std::prev(iterCur);
-                if (iterCur == steps.begin())
+                if (iterCur == steps.begin() && iterCur != steps.end())
                     ++iterCur;
             };
 
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