diff --git a/data/maker/prepare/__init__.py b/data/maker/prepare/__init__.py
index c91c773..f025294 100644
--- a/data/maker/prepare/__init__.py
+++ b/data/maker/prepare/__init__.py
@@ -265,7 +265,7 @@ class Input :
         _values = np.array( list(self._map.values()))
         _matrix = pd.DataFrame(_matrix) #if type(_matrix) != pd.DataFrame else _matrix
         # x = _matrix.apply(lambda row: _values[row.values == 1 ].tolist()[0] if row.values.sum() > 0 else None, axis=1).tolist()
-        x = _matrix.apply(lambda row: _values[row.values == 1].tolist()[0] if (row.values == 1).sum() > 0 else None ,axis=1).tolist()
+        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()
         return pd.DataFrame(x,columns=columns)