From c767d5458be60133b8136090d1f94fb5f37f1953 Mon Sep 17 00:00:00 2001
From: Erwan MATHIEU <erwan.mathieu@ultimaker.com>
Date: Fri, 16 Feb 2024 11:48:07 +0100
Subject: [PATCH] Fix crash when using raft with airgap pseudo-layers

---
 src/FffGcodeWriter.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/FffGcodeWriter.cpp b/src/FffGcodeWriter.cpp
index 8d39751c5f..ae15349935 100644
--- a/src/FffGcodeWriter.cpp
+++ b/src/FffGcodeWriter.cpp
@@ -1538,7 +1538,10 @@ void FffGcodeWriter::calculateExtruderOrderPerLayer(const SliceDataStorage& stor
         std::vector<ExtruderUse> extruder_order = getUsedExtrudersOnLayerExcludingStartingExtruder(storage, last_extruder, layer_nr);
         extruder_order_per_layer_here.push_back(extruder_order);
 
-        last_extruder = extruder_order.back().extruder_nr;
+        if (! extruder_order.empty())
+        {
+            last_extruder = extruder_order.back().extruder_nr;
+        }
     }
 }