diff --git a/src/gui_qt/math/evaluation.py b/src/gui_qt/math/evaluation.py
index c74bf14..f27a16f 100644
--- a/src/gui_qt/math/evaluation.py
+++ b/src/gui_qt/math/evaluation.py
@@ -37,13 +37,12 @@ class QEvalDialog(QtWidgets.QDialog, Ui_CalcDialog):
             tmp.append(self.listWidget.takeItem(0))
 
         for set_id, name in data:
-
             # search if set was used before
             new_one = True
             for i in range(len(tmp)):
                 w = tmp[i]
                 if w.data(QtCore.Qt.UserRole) == set_id:
-
+                    w.setText(name)
                     self.listWidget.addItem(w)
                     tmp.pop(i)
                     new_one = False
@@ -60,7 +59,7 @@ class QEvalDialog(QtWidgets.QDialog, Ui_CalcDialog):
         while len(tmp):
             # delete remaining ListWidgetItems
             w = tmp.pop()
-            w.deleteLater()
+            del w
 
     def set_graphs(self, graphs: list):
         self.graph_comboBox.clear()