diff --git a/plugins/3MFReader/ThreeMFWorkspaceReader.py b/plugins/3MFReader/ThreeMFWorkspaceReader.py
index 88c79f2b84..0905b6fba9 100755
--- a/plugins/3MFReader/ThreeMFWorkspaceReader.py
+++ b/plugins/3MFReader/ThreeMFWorkspaceReader.py
@@ -1240,7 +1240,10 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
             root_material_id = extruder_info.root_material_id
             root_material_id = self._old_new_materials.get(root_material_id, root_material_id)
 
-            material_node = machine_node.variants[extruder_stack.variant.getName()].materials[root_material_id]
+            available_materials = machine_node.variants[extruder_stack.variant.getName()].materials
+            if root_material_id not in available_materials:
+                continue
+            material_node = available_materials[root_material_id]
             extruder_stack.material = material_node.container
 
     def _clearMachineSettings(self, global_stack, extruder_stack_dict):