diff --git a/processing/pre/geom_grainGrowth.py b/processing/pre/geom_grainGrowth.py
index bdf8d8efe..6d1985ee3 100755
--- a/processing/pre/geom_grainGrowth.py
+++ b/processing/pre/geom_grainGrowth.py
@@ -169,7 +169,7 @@ for name in filenames:
     # undo any changes involving immutable microstructures
     microstructure = np.where(immutable, microstructure_original,microstructure)
 
-  damask.util.croak(geom.update(microstructure[0:grid_original[0],0:grid_original[1],0:grid_original[2]]))
+  geom=geom.duplicate(microstructure[0:grid_original[0],0:grid_original[1],0:grid_original[2]])
   geom.add_comments(scriptID + ' ' + ' '.join(sys.argv[1:]))
 
   geom.to_file(sys.stdout if name is None else name,pack=False)