diff --git a/plugins/3MFWriter/ThreeMFWriter.py b/plugins/3MFWriter/ThreeMFWriter.py
index c507703823..3bb1d44e01 100644
--- a/plugins/3MFWriter/ThreeMFWriter.py
+++ b/plugins/3MFWriter/ThreeMFWriter.py
@@ -12,6 +12,7 @@ from UM.Application import Application
 from UM.Message import Message
 from UM.Resources import Resources
 from UM.Scene.SceneNode import SceneNode
+from UM.Settings.EmptyInstanceContainer import EmptyInstanceContainer
 
 from cura.CuraApplication import CuraApplication
 from cura.CuraPackageManager import CuraPackageManager
@@ -268,6 +269,10 @@ class ThreeMFWriter(MeshWriter):
                 # Don't export materials not in use
                 continue
 
+            if type(extruder.material) is EmptyInstanceContainer:
+                # This is an empty material container, no material to export
+                continue
+
             if package_manager.isMaterialBundled(extruder.material.getFileName(), extruder.material.getMetaDataEntry("GUID")):
                 # Don't export bundled materials
                 continue