From ae168e009b237d994bc5f406bdc2f0608330c3a9 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Thu, 22 Apr 2021 22:51:19 +0200
Subject: ConcatenatedOperation::fixStepsDirection(): fix potential nullptr
 dereference

---
 src/iso19111/operation/concatenatedoperation.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/iso19111/operation/concatenatedoperation.cpp b/src/iso19111/operation/concatenatedoperation.cpp
index ce4b015a..a1c0dca8 100644
--- a/src/iso19111/operation/concatenatedoperation.cpp
+++ b/src/iso19111/operation/concatenatedoperation.cpp
@@ -321,7 +321,8 @@ void ConcatenatedOperation::fixStepsDirection(
                 if (l_sourceCRS) {
                     derivedCRS = dynamic_cast<const crs::DerivedCRS *>(
                         l_sourceCRS.get());
-                    if (conv->isEquivalentTo(
+                    if (derivedCRS &&
+                        conv->isEquivalentTo(
                             derivedCRS->derivingConversion().get(),
                             util::IComparable::Criterion::EQUIVALENT)) {
                         op->setCRSs(concatOpTargetCRS, NN_NO_CHECK(l_sourceCRS),
-- 
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