diff --git a/samples/file_center_of_mass/file_center_of_mass.py b/samples/file_center_of_mass/file_center_of_mass.py
index 1c90b62..5c9f1ac 100755
--- a/samples/file_center_of_mass/file_center_of_mass.py
+++ b/samples/file_center_of_mass/file_center_of_mass.py
@@ -29,6 +29,9 @@
 if isinstance(fm, Error) or fm is None:
     raise Exception("There was a problem")
 
+if fm.center_of_mass is None:
+    raise Exception("There was a problem")
+
 print(f"File center of mass (meters): {fm.center_of_mass}")
 
 partInfo = {