diff --git a/src/gui_qt/fit/fit_parameter.py b/src/gui_qt/fit/fit_parameter.py
index bcb3d1f..69b7301 100644
--- a/src/gui_qt/fit/fit_parameter.py
+++ b/src/gui_qt/fit/fit_parameter.py
@@ -263,17 +263,17 @@ class QFitParameterWidget(QtWidgets.QWidget, Ui_FormFit):
         return data_parameter, lb, ub, is_fixed, global_p, is_linked
 
     def set_parameter(self, set_id: str | None, parameter: list[float]) -> int:
-        param_len = len(list(filter(lambda g: not isinstance(g, SelectionWidget), self.global_parameter)))
-
+        num_parameter = list(filter(lambda g: not isinstance(g, SelectionWidget), self.global_parameter))
+        param_len = len(num_parameter)
         if set_id is None:
-            for val, g in zip(parameter, self.global_parameter):
-                if isinstance(g, SelectionWidget):
-                    continue
+            for i, g in enumerate(num_parameter):
+                val = parameter[i]
                 g.set_parameter(val)
+                self.glob_values[i] = val
 
         else:
             new_param = self.data_values[set_id]
-            min_len = min(param_len, len(new_param), len(new_param))
+            min_len = min(param_len, len(new_param))
             for i in range(min_len):
                 new_param[i] = parameter[i]
 
diff --git a/src/gui_qt/fit/fitwindow.py b/src/gui_qt/fit/fitwindow.py
index 9a77171..5ba0ea6 100644
--- a/src/gui_qt/fit/fitwindow.py
+++ b/src/gui_qt/fit/fitwindow.py
@@ -77,16 +77,11 @@ class QFitDialog(QtWidgets.QWidget, Ui_FitDialog):
         w.deleteLater()
         del self.param_widgets[idx]
 
-        if len(self.functionwidget) == 0:
+        self._current_function = None
+        if len(self.param_widgets) == 0:
             # empty model
             self.newmodel_button.setEnabled(False)
             self.deletemodel_button.setEnabled(False)
-            self._current_function = None
-
-        else:
-            f_tree = self.functionwidget.functree
-            func_idx = f_tree.currentItem().data(0, f_tree.counterRole)
-            self._current_function = self.functionwidget.functions[func_idx]
 
     @QtCore.pyqtSlot(int)
     def show_function_parameter(self, function_id: int, function_idx: int = None):