diff --git a/storage.py b/storage.py
index 1e632fc..81968a7 100644
--- a/storage.py
+++ b/storage.py
@@ -239,7 +239,7 @@ class DataStorage(dict):
     for k in keys:
       if k[0] == "_": continue
       obj = self[k]
-      if isinstance(obj,(list,tuple,np.ndarray)) and all( [isinstance(v,np.ndarray) for v in obj]):
+      if isinstance(obj,(list,tuple,np.ndarray)) and all( [isinstance(v,np.ndarray) for v in obj]) and obj.ndim == 1:
         value_str = "list of arrays, shapes " + ",".join([str(v.shape) for v in obj[:5]]) + " ..."
       elif isinstance(obj,np.ndarray):
         value_str = "array, size %s, type %s"% ("x".join(map(str,obj.shape)),obj.dtype)