diff --git a/src/gui_qt/fit/fit_forms.py b/src/gui_qt/fit/fit_forms.py
index 60c3191..2a9c4a2 100644
--- a/src/gui_qt/fit/fit_forms.py
+++ b/src/gui_qt/fit/fit_forms.py
@@ -70,7 +70,7 @@ class FitModelTree(QtWidgets.QTreeWidget):
                 self.remove_function(item)
 
         elif evt.key() == QtCore.Qt.Key.Key_Space:
-            for item in self.treeWidget.selectedItems():
+            for item in self.selectedItems():
                 cs = item.checkState(0)
                 if cs == QtCore.Qt.CheckState.Unchecked:
                     item.setCheckState(0, QtCore.Qt.CheckState.Checked)
diff --git a/src/nmreval/fit/_meta.py b/src/nmreval/fit/_meta.py
index 889cc57..2c9fdf6 100644
--- a/src/nmreval/fit/_meta.py
+++ b/src/nmreval/fit/_meta.py
@@ -26,8 +26,13 @@ class ModelFactory:
             if func['children']:
                 right, _, _ = ModelFactory.create_from_list(func['children'], left_cnt=func['pos'],
                                                             func_order=func_order, param_len=param_len)
-                right_cnt = None
-                right = MultiModel(func['func'], right, func['children'][0]['op'], left_idx=func['cnt'], right_idx=None)
+
+                if right is None:
+                    right = func['func']
+                    right_cnt = func['cnt']
+                else:
+                    right_cnt = None
+                    right = MultiModel(func['func'], right, func['children'][0]['op'], left_idx=func['cnt'], right_idx=None)
             else:
                 right = func['func']
                 right_cnt = func['cnt']