From 56b8adb9e241a5a560592b25dc44b02c8790cff3 Mon Sep 17 00:00:00 2001
From: Jacques Lucke <jacques@blender.org>
Date: Thu, 16 Jul 2020 16:41:36 +0200
Subject: Particles: avoid crash when connected unimplemented node

---
 source/blender/blenkernel/intern/simulation.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/source/blender/blenkernel/intern/simulation.cc b/source/blender/blenkernel/intern/simulation.cc
index 7ba6e07fb64..831de084500 100644
--- a/source/blender/blenkernel/intern/simulation.cc
+++ b/source/blender/blenkernel/intern/simulation.cc
@@ -619,9 +619,12 @@ static const ParticleFunction *create_particle_function_for_inputs(
 
   Vector<const ParticleFunctionInput *> per_particle_inputs;
   for (const fn::MFOutputSocket *socket : dummy_deps) {
-    StringRef attribute_name = attribute_inputs.lookup(socket);
+    const std::string *attribute_name = attribute_inputs.lookup_ptr(socket);
+    if (attribute_name == nullptr) {
+      return nullptr;
+    }
     per_particle_inputs.append(&resources.construct<ParticleAttributeInput>(
-        AT, attribute_name, socket->data_type().single_type()));
+        AT, *attribute_name, socket->data_type().single_type()));
   }
 
   const fn::MultiFunction &per_particle_fn = resources.construct<fn::MFNetworkEvaluator>(
-- 
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