From 0dbff99390d1a027d89d89762af23121224a9415 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Fri, 18 Mar 2022 22:21:20 +0100
Subject: SingleCRS::baseIsEquivalentTo(): fix potential crash that is
 triggered by fdf5111a9a790926aacec75a07d30508a8ed9c91 changes

---
 src/iso19111/crs.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/iso19111/crs.cpp b/src/iso19111/crs.cpp
index e4b8094f..e6f38e49 100644
--- a/src/iso19111/crs.cpp
+++ b/src/iso19111/crs.cpp
@@ -1460,7 +1460,8 @@ bool SingleCRS::baseIsEquivalentTo(
         const auto &thisDatum = d->datum;
         const auto &otherDatum = otherSingleCRS->d->datum;
         if (thisDatum) {
-            if (!thisDatum->_isEquivalentTo(otherDatum.get(), criterion,
+            if (otherDatum == nullptr ||
+                !thisDatum->_isEquivalentTo(otherDatum.get(), criterion,
                                             dbContext)) {
                 return false;
             }
@@ -1473,7 +1474,8 @@ bool SingleCRS::baseIsEquivalentTo(
         const auto &thisDatumEnsemble = d->datumEnsemble;
         const auto &otherDatumEnsemble = otherSingleCRS->d->datumEnsemble;
         if (thisDatumEnsemble) {
-            if (!thisDatumEnsemble->_isEquivalentTo(otherDatumEnsemble.get(),
+            if (otherDatumEnsemble == nullptr ||
+                !thisDatumEnsemble->_isEquivalentTo(otherDatumEnsemble.get(),
                                                     criterion, dbContext)) {
                 return false;
             }
-- 
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