diff --git a/model_server/base/roiset.py b/model_server/base/roiset.py
index 33c30c1241a06ca7c6da9ba06ad1aa2e98f74c4d..7cd327ae2403509a5486af4eb145a6514e62dcdd 100644
--- a/model_server/base/roiset.py
+++ b/model_server/base/roiset.py
@@ -290,16 +290,11 @@ class RoiSet(object):
 
         # assign labels to object map:
         for i, roi in enumerate(self):
-            try:
-                oc = np.unique(
-                    mask_largest_object(
-                        obmap_patches.iat(i).data
-                    )
-                )[-1]
-            except Exception as e:
-                print(i)
-                print(np.unique(mask_largest_object(obmap_patches.iat(i).data)))
-                raise e
+            oc = np.unique(
+                mask_largest_object(
+                    obmap_patches.iat(i).data
+                )
+            )[-1]
             self._df.loc[roi.Index, 'classify_by_' + name] = oc
             om[self.acc_obj_ids.data == roi.label] = oc
         self.object_class_maps[name] = InMemoryDataAccessor(om)