diff --git a/plugins/CuraEngineBackend/LayerData.py b/plugins/CuraEngineBackend/LayerData.py
index c793c17504..597839ea39 100644
--- a/plugins/CuraEngineBackend/LayerData.py
+++ b/plugins/CuraEngineBackend/LayerData.py
@@ -28,7 +28,8 @@ class LayerData(MeshData):
         self._layers[layer].polygons.append(p)
 
     def getLayer(self, layer):
-        return self._layers[layer]
+        if layer in self._layers:
+            return self._layers[layer]
 
     def getLayers(self):
         return self._layers