From 5c645fcdf3f9e3f8b21c71b076d59810670ae28a Mon Sep 17 00:00:00 2001
From: Jan Kleinert <jan.kleinert@dlr.de>
Date: Fri, 15 Dec 2023 15:09:21 +0100
Subject: [PATCH] fix #962

---
 src/guide_curves/CCPACSGuideCurves.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/guide_curves/CCPACSGuideCurves.cpp b/src/guide_curves/CCPACSGuideCurves.cpp
index ad9f765dc..630a453ec 100644
--- a/src/guide_curves/CCPACSGuideCurves.cpp
+++ b/src/guide_curves/CCPACSGuideCurves.cpp
@@ -97,6 +97,13 @@ bool CCPACSGuideCurves::GuideCurveExists(std::string uid) const
 std::vector<double> CCPACSGuideCurves::GetRelativeCircumferenceParameters() const
 {
     std::vector<double> relCircs;
+
+    // CPACS 3.3 requires guideCurves to be present. To prevent a hard crash if this is NOT the case,
+    // we shoud exit here (or at least before the call to relCircs.back())
+    if (GetGuideCurveCount() == 0) {
+        return relCircs;
+    }
+
     for (int iguide = 1; iguide <=  GetGuideCurveCount(); ++iguide) {
         const CCPACSGuideCurve* root = GetGuideCurve(iguide).GetRootCurve();
         relCircs.push_back(*root->GetFromRelativeCircumference_choice2());