diff --git a/src/murfey/workflows/sxt/sxt_metadata.py b/src/murfey/workflows/sxt/sxt_metadata.py
index 642257fc5..57c9e95d7 100644
--- a/src/murfey/workflows/sxt/sxt_metadata.py
+++ b/src/murfey/workflows/sxt/sxt_metadata.py
@@ -110,7 +110,7 @@ def register_sxt_roi(
             f"Unable to register roi {sanitise(roi.name)} position yet: "
             f"roi pixel size {sanitise(str(roi.pixel_size))}, "
             f"atlas pixel size {sanitise(str(dcg.atlas_pixel_size))}, "
-            f"roi pixel size {sanitise(str(atlas.image_pixel_size))}"
+            f"roi pixel size {sanitise(str(atlas.image_pixel_size)) if atlas else 0}"
         )
     murfey_db.add(roi)
     murfey_db.commit()