diff --git a/data/maker/prepare/__init__.py b/data/maker/prepare/__init__.py
index 1fae46c..a19fd31 100644
--- a/data/maker/prepare/__init__.py
+++ b/data/maker/prepare/__init__.py
@@ -269,7 +269,7 @@ class Input :
         
         # 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()
         
-        x = _matrix.apply(lambda row: _values[row.values == 1].tolist()[0] if (row.values == 1).sum() > 0 else np.random.choice(np.matrix.flatten(_values,1)).tolist() ,axis=1).tolist()
+        x = _matrix.apply(lambda row: _values[row.values == 1].tolist()[0] if (row.values == 1).sum() > 0 else _values[np.random.choice(_values.size,1 )].tolist() ,axis=1).tolist()
         return pd.DataFrame(x,columns=columns)