diff --git a/system/dataset.py b/system/dataset.py
index a9d0d31..f9a0a80 100644
--- a/system/dataset.py
+++ b/system/dataset.py
@@ -151,8 +151,12 @@ class Dataset:
         Identifiers are the unique names (strings) for a variable in a given dim.
         Index (Indices) are the Identifiers position in a matrix in a given dim.
         """
-        if len(indices)==0:
-            indices=[]
+        try:
+            if len(indices)==0:# if empty list or empty array 
+                indices=[]
+        except:
+            pass
+        
         if sorted==True:
             items = self._map[dim].items()
             backitems = [ [v[1],v[0]] for v in items]