diff --git a/data/maker/prepare/__init__.py b/data/maker/prepare/__init__.py
index 15cbe99..1adc44d 100644
--- a/data/maker/prepare/__init__.py
+++ b/data/maker/prepare/__init__.py
@@ -268,7 +268,7 @@ class Input :
         #@TODO: Provide random values for things that are missing
         
         # x = _matrix.apply(lambda row: _values[row.values == 1].tolist()[0] if (row.values == 1).sum() > 0 else np.repeat(None,len(self._columns)) ,axis=1).tolist()
-        novalues = _values[np.random.choice(_values.size,1)[0]].tolist()
+        novalues = _values[np.random.choice( len(_values),1)[0]].tolist()
         # novalues = np.repeat(None,len(self._columns))
         x = _matrix.apply(lambda row: _values[row.values == 1].tolist()[0] if (row.values == 1).sum() > 0 else novalues ,axis=1).tolist()
         return pd.DataFrame(x,columns=columns)