diff --git a/pyFTS/partitioners/partitioner.py b/pyFTS/partitioners/partitioner.py
index 14eb4a8..aef4172 100644
--- a/pyFTS/partitioners/partitioner.py
+++ b/pyFTS/partitioners/partitioner.py
@@ -47,7 +47,7 @@ class Partitioner(object):
 
             data = kwargs.get('data',[None])
             
-            if len(data.shape) > 1:
+            if isinstance(data, np.ndarray) and len(data.shape) > 1:
                 warnings.warn(f"An ndarray of dimension greater than 1 is used. shape.len(): {len(data.shape)}")
 
             if self.indexer is not None: