From dc66271575f8a4e1539566f13b8027de4fe42681 Mon Sep 17 00:00:00 2001
From: "ADS\\lanierd" <david.lanier@autodesk.com>
Date: Thu, 12 Dec 2024 15:51:32 +0100
Subject: [PATCH] HYDRA-1292 : Fix a freeze with Mtx openpbr deletion

---
 lib/mayaHydra/hydraExtensions/adapters/materialAdapter.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/mayaHydra/hydraExtensions/adapters/materialAdapter.cpp b/lib/mayaHydra/hydraExtensions/adapters/materialAdapter.cpp
index b69c5b829b..e807ab2b5d 100644
--- a/lib/mayaHydra/hydraExtensions/adapters/materialAdapter.cpp
+++ b/lib/mayaHydra/hydraExtensions/adapters/materialAdapter.cpp
@@ -263,7 +263,10 @@ class MayaHydraShadingEngineAdapter : public MayaHydraMaterialAdapter
         }
 
         // Construct a MaterialX document
-        auto mtlxDocStr = mtlxDocPlug.asString();
+        const MString mtlxDocStr = mtlxDocPlug.asString();
+        if (0 == mtlxDocStr.length()) {
+            return false;
+        }
         auto mtlxDoc = MaterialX::createDocument();
         MaterialX::readFromXmlString(mtlxDoc, mtlxDocStr.asChar());