diff --git a/src/gui_qt/io/gracereader.py b/src/gui_qt/io/gracereader.py
index ca1e414..987bed8 100644
--- a/src/gui_qt/io/gracereader.py
+++ b/src/gui_qt/io/gracereader.py
@@ -56,8 +56,12 @@ class QGraceReader(QtWidgets.QDialog, Ui_Dialog):
                 if ds is None:
                     continue
 
-                item_2 = QtWidgets.QTreeWidgetItem([f'Set {gset.idx} (Label:  {convert(gset.get_property("legend"), old="agr", new="str")}, '
+                legend = gset.get_property('legend')
+                legend_str = convert(legend, old='agr', new='str') if legend is not None else ''
+
+                item_2 = QtWidgets.QTreeWidgetItem([f'Set {gset.idx} (Label:  {legend_str}, '
                                                     f'shape: {ds.shape})'])
+
                 item_2.setCheckState(0, QtCore.Qt.Checked)
                 item_2.setData(0, QtCore.Qt.UserRole, (graphs.idx, gset.idx))
                 item.addChild(item_2)