From 5da2c7116577dd6407e6093992021cfd972ce08e Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 20 Jul 2020 10:39:16 -0400
Subject: GHS: Fix crash when GHS_NO_SOURCE_GROUP_FILE property is not defined

Refactoring in commit 36aba01223 (cmGeneratorTarget::GetProperty: return
cmProp, 2020-04-29, v3.18.0-rc1~246^2) left out a `nullptr` check.

Fixes: #20985
---
 Source/cmGhsMultiTargetGenerator.cxx | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Source/cmGhsMultiTargetGenerator.cxx b/Source/cmGhsMultiTargetGenerator.cxx
index 358d65a..97580d6 100644
--- a/Source/cmGhsMultiTargetGenerator.cxx
+++ b/Source/cmGhsMultiTargetGenerator.cxx
@@ -550,8 +550,9 @@ void cmGhsMultiTargetGenerator::WriteSources(std::ostream& fout_proj)
    */
   for (auto& sg : groupFilesList) {
     std::ostream* fout;
-    bool useProjectFile = cmIsOn(*this->GeneratorTarget->GetProperty(
-                            "GHS_NO_SOURCE_GROUP_FILE")) ||
+    cmProp noSourceGroupFile =
+      this->GeneratorTarget->GetProperty("GHS_NO_SOURCE_GROUP_FILE");
+    bool useProjectFile = (noSourceGroupFile && cmIsOn(*noSourceGroupFile)) ||
       cmIsOn(this->Makefile->GetDefinition("CMAKE_GHS_NO_SOURCE_GROUP_FILE"));
     if (useProjectFile || sg.empty()) {
       fout = &fout_proj;
-- 
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